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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_44197A604A88486A1EC03C19A84AD93C_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_44197A604A88486A1EC03C19A84AD93C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets by Major Class [Axis]</link:label>
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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_B7125C819DB530E8DD823C19A84A91AB_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_B7125C819DB530E8DD823C19A84A91AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Major Class Name [Domain]</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_B7125C819DB530E8DD823C19A84A91AB_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_B7125C819DB530E8DD823C19A84A91AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Major Class Name [Domain]</link:label>
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    <link:label id="lab_us-gaap_CustomerRelationshipsMember_4D9EB95AEECD3E5E0FCE3C19A84A6697_terseLabel_en-US" xlink:label="lab_us-gaap_CustomerRelationshipsMember_4D9EB95AEECD3E5E0FCE3C19A84A6697" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Customer Relationships</link:label>
    <link:label id="lab_us-gaap_CustomerRelationshipsMember_4D9EB95AEECD3E5E0FCE3C19A84A6697_label_en-US" xlink:label="lab_us-gaap_CustomerRelationshipsMember_4D9EB95AEECD3E5E0FCE3C19A84A6697" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer Relationships [Member]</link:label>
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    <link:label id="lab_us-gaap_RealEstateMember_0B1F50B2EDF9167AEA2F3C19A84AD014_terseLabel_en-US" xlink:label="lab_us-gaap_RealEstateMember_0B1F50B2EDF9167AEA2F3C19A84AD014" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Real Estate Options</link:label>
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    <link:label id="lab_htld_DebtInstrumentCovenantLeverageRatio_B86162CA019163BDCFB1446A352C042E_documentation_en-US" xlink:label="lab_htld_DebtInstrumentCovenantLeverageRatio_B86162CA019163BDCFB1446A352C042E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Instrument, Covenant, Leverage Ratio</link:label>
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    <link:label id="lab_htld_DebtCovenantMinimumNetIncomeRequirement_6412BAA7619ACDA70243446A352C6DB7_label_en-US" xlink:label="lab_htld_DebtCovenantMinimumNetIncomeRequirement_6412BAA7619ACDA70243446A352C6DB7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Covenant, Minimum Net Income Requirement</link:label>
    <link:label id="lab_htld_DebtCovenantMinimumNetIncomeRequirement_6412BAA7619ACDA70243446A352C6DB7_documentation_en-US" xlink:label="lab_htld_DebtCovenantMinimumNetIncomeRequirement_6412BAA7619ACDA70243446A352C6DB7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Covenant, Minimum Net Income Requirement</link:label>
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    <link:label id="lab_htld_DebtCovenantMinimumTangibleNetWorth_9CDDEC0F6188BD073CDF446A352C03A2_documentation_en-US" xlink:label="lab_htld_DebtCovenantMinimumTangibleNetWorth_9CDDEC0F6188BD073CDF446A352C03A2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt Covenant, Minimum Tangible Net Worth</link:label>
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    <link:label id="lab_htld_StockBasedCompensationAbstract_DC1391739D26D8B22600686267301BFA_label_en-US" xlink:label="lab_htld_StockBasedCompensationAbstract_DC1391739D26D8B22600686267301BFA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock-Based Compensation [Abstract]</link:label>
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    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_833F64257512F538B0F268626730F6F9_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_833F64257512F538B0F268626730F6F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of Compensation Related Costs, Share-based Payments [Text Block]</link:label>
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    <link:label id="lab_us-gaap_TreasuryStockMember_C4AEC7244C99ED78FA3968626758BACE_label_en-US" xlink:label="lab_us-gaap_TreasuryStockMember_C4AEC7244C99ED78FA3968626758BACE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Treasury Stock [Member]</link:label>
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    <link:label id="lab_us-gaap_StockholdersEquity_F1D45AF3306DED7C9CDA6862675850DF_label_en-US" xlink:label="lab_us-gaap_StockholdersEquity_F1D45AF3306DED7C9CDA6862675850DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Attributable to Parent</link:label>
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    <link:label id="lab_us-gaap_NetIncomeLoss_F15707445154782AC3F2686267581BA6_label_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_F15707445154782AC3F2686267581BA6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Attributable to Parent</link:label>
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    <link:label id="lab_us-gaap_BusinessAcquisitionAcquireeDomain_1955893F0263E8D70521446A351CC231_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAcquireeDomain_1955893F0263E8D70521446A351CC231" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Acquisition, Acquiree [Domain]</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionAcquireeDomain_1955893F0263E8D70521446A351CC231_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAcquireeDomain_1955893F0263E8D70521446A351CC231" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Acquiree [Domain]</link:label>
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    <link:label id="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_9133E942903479C66C92446A351CAB48_terseLabel_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_9133E942903479C66C92446A351CAB48" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property Subject to or Available for Operating Lease [Axis]</link:label>
    <link:label id="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_9133E942903479C66C92446A351CAB48_label_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis_9133E942903479C66C92446A351CAB48" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property Subject to or Available for Operating Lease [Axis]</link:label>
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    <link:label id="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_5A97A6A6A56673BF7026446A351CE654_terseLabel_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_5A97A6A6A56673BF7026446A351CE654" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property Subject to or Available for Operating Lease [Domain]</link:label>
    <link:label id="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_5A97A6A6A56673BF7026446A351CE654_label_en-US" xlink:label="lab_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseDomain_5A97A6A6A56673BF7026446A351CE654" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property Subject to or Available for Operating Lease [Domain]</link:label>
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    <link:label id="lab_htld_TerminalFacilitiesMember_CAA433A49F90A926AC41446A351CF89A_terseLabel_en-US" xlink:label="lab_htld_TerminalFacilitiesMember_CAA433A49F90A926AC41446A351CF89A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Terminal Facilities</link:label>
    <link:label id="lab_htld_TerminalFacilitiesMember_CAA433A49F90A926AC41446A351CF89A_label_en-US" xlink:label="lab_htld_TerminalFacilitiesMember_CAA433A49F90A926AC41446A351CF89A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Terminal Facilities [Member]</link:label>
    <link:label id="lab_htld_TerminalFacilitiesMember_CAA433A49F90A926AC41446A351CF89A_documentation_en-US" xlink:label="lab_htld_TerminalFacilitiesMember_CAA433A49F90A926AC41446A351CF89A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Terminal Facilities [Member]</link:label>
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    <link:label id="lab_us-gaap_LeaseArrangementTypeAxis_108AF438FBBE3C0E3186446A351C3140_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeAxis_108AF438FBBE3C0E3186446A351C3140" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Parties to Contractual Arrangement [Axis]</link:label>
    <link:label id="lab_us-gaap_LeaseArrangementTypeAxis_108AF438FBBE3C0E3186446A351C3140_label_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeAxis_108AF438FBBE3C0E3186446A351C3140" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease Arrangement, Type [Axis]</link:label>
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    <link:label id="lab_us-gaap_LeaseArrangementTypeDomain_6053B1135B598C75C215446A351C1D5B_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeDomain_6053B1135B598C75C215446A351C1D5B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Parties to Contractual Arrangement [Domain]</link:label>
    <link:label id="lab_us-gaap_LeaseArrangementTypeDomain_6053B1135B598C75C215446A351C1D5B_label_en-US" xlink:label="lab_us-gaap_LeaseArrangementTypeDomain_6053B1135B598C75C215446A351C1D5B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lease Arrangement, Type [Domain]</link:label>
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    <link:label id="lab_htld_RelatedPartyMember_9333CA2436D926868762446A351CAFB5_terseLabel_en-US" xlink:label="lab_htld_RelatedPartyMember_9333CA2436D926868762446A351CAFB5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Related Party</link:label>
    <link:label id="lab_htld_RelatedPartyMember_9333CA2436D926868762446A351CAFB5_label_en-US" xlink:label="lab_htld_RelatedPartyMember_9333CA2436D926868762446A351CAFB5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Related Party [Member]</link:label>
    <link:label id="lab_htld_RelatedPartyMember_9333CA2436D926868762446A351CAFB5_documentation_en-US" xlink:label="lab_htld_RelatedPartyMember_9333CA2436D926868762446A351CAFB5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Related Party [Member]</link:label>
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    <link:label id="lab_us-gaap_OperatingLeasedAssetsLineItems_33397CBD1D9874195858446A351C69A2_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasedAssetsLineItems_33397CBD1D9874195858446A351C69A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Leased Assets [Line Items]</link:label>
    <link:label id="lab_us-gaap_OperatingLeasedAssetsLineItems_33397CBD1D9874195858446A351C69A2_label_en-US" xlink:label="lab_us-gaap_OperatingLeasedAssetsLineItems_33397CBD1D9874195858446A351C69A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leased Assets [Line Items]</link:label>
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    <link:label id="lab_us-gaap_DueToRelatedPartiesCurrent_8AA5B41A57DC7C8C8638446A351CBE1F_terseLabel_en-US" xlink:label="lab_us-gaap_DueToRelatedPartiesCurrent_8AA5B41A57DC7C8C8638446A351CBE1F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Due to Related Parties, Current</link:label>
    <link:label id="lab_us-gaap_DueToRelatedPartiesCurrent_8AA5B41A57DC7C8C8638446A351CBE1F_label_en-US" xlink:label="lab_us-gaap_DueToRelatedPartiesCurrent_8AA5B41A57DC7C8C8638446A351CBE1F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Due to Related Parties, Current</link:label>
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    <link:label id="lab_us-gaap_LeaseAndRentalExpense_DAA95FCED8F2909EC7D0446A351C4C8F_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_DAA95FCED8F2909EC7D0446A351C4C8F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating Leases, Rent Expense</link:label>
    <link:label id="lab_us-gaap_LeaseAndRentalExpense_DAA95FCED8F2909EC7D0446A351C4C8F_label_en-US" xlink:label="lab_us-gaap_LeaseAndRentalExpense_DAA95FCED8F2909EC7D0446A351C4C8F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Leases, Rent Expense</link:label>
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    <link:label id="lab_htld_Relatedpartypaymentforterminalpurchase_0C5BC322083F252E7201446A351C2A63_terseLabel_en-US" xlink:label="lab_htld_Relatedpartypaymentforterminalpurchase_0C5BC322083F252E7201446A351C2A63" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">related party payment for terminal purchase</link:label>
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    <link:label id="lab_us-gaap_IncomeStatementAbstract_813A37D29835900A97826862676CA54E_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_813A37D29835900A97826862676CA54E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement [Abstract]</link:label>
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    <link:label id="lab_htld_RentAndPurchasedTransportation_ED9867D67EFDAFE4490C6862676C2CA4_terseLabel_en-US" xlink:label="lab_htld_RentAndPurchasedTransportation_ED9867D67EFDAFE4490C6862676C2CA4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rent and purchased transportation</link:label>
    <link:label id="lab_htld_RentAndPurchasedTransportation_ED9867D67EFDAFE4490C6862676C2CA4_label_en-US" xlink:label="lab_htld_RentAndPurchasedTransportation_ED9867D67EFDAFE4490C6862676C2CA4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rent and purchased transportation</link:label>
    <link:label id="lab_htld_RentAndPurchasedTransportation_ED9867D67EFDAFE4490C6862676C2CA4_documentation_en-US" xlink:label="lab_htld_RentAndPurchasedTransportation_ED9867D67EFDAFE4490C6862676C2CA4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Payment of rentals incurred in the period on property and equipment including payments made to independent contractors for providing and operating revenue equipment owned and maintained by independent contractors.</link:label>
    <link:loc xlink:href="htld-20160930.xsd#htld_RentAndPurchasedTransportation" xlink:label="loc_htld_RentAndPurchasedTransportation_ED9867D67EFDAFE4490C6862676C2CA4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FuelCosts_9E449F7810D2B411FD076862676CFCBC_terseLabel_en-US" xlink:label="lab_us-gaap_FuelCosts_9E449F7810D2B411FD076862676CFCBC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fuel</link:label>
    <link:label id="lab_us-gaap_FuelCosts_9E449F7810D2B411FD076862676CFCBC_label_en-US" xlink:label="lab_us-gaap_FuelCosts_9E449F7810D2B411FD076862676CFCBC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fuel Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FuelCosts" xlink:label="loc_us-gaap_FuelCosts_9E449F7810D2B411FD076862676CFCBC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FuelCosts_9E449F7810D2B411FD076862676CFCBC" xlink:to="lab_us-gaap_FuelCosts_9E449F7810D2B411FD076862676CFCBC" xlink:type="arc" />
    <link:label id="lab_us-gaap_CostOfServicesMaintenanceCosts_753371E51E17875DC5946862676C30DC_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfServicesMaintenanceCosts_753371E51E17875DC5946862676C30DC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operations and maintenance</link:label>
    <link:label id="lab_us-gaap_CostOfServicesMaintenanceCosts_753371E51E17875DC5946862676C30DC_label_en-US" xlink:label="lab_us-gaap_CostOfServicesMaintenanceCosts_753371E51E17875DC5946862676C30DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost of Services, Maintenance Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CostOfServicesMaintenanceCosts" xlink:label="loc_us-gaap_CostOfServicesMaintenanceCosts_753371E51E17875DC5946862676C30DC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfServicesMaintenanceCosts_753371E51E17875DC5946862676C30DC" xlink:to="lab_us-gaap_CostOfServicesMaintenanceCosts_753371E51E17875DC5946862676C30DC" xlink:type="arc" />
    <link:label id="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_3322A88EC302920B47116862676C61B9_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_3322A88EC302920B47116862676C61B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating taxes and licenses</link:label>
    <link:label id="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_3322A88EC302920B47116862676C61B9_label_en-US" xlink:label="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_3322A88EC302920B47116862676C61B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost of Services, Direct Taxes and Licenses Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CostOfServicesDirectTaxesAndLicensesCosts" xlink:label="loc_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_3322A88EC302920B47116862676C61B9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_3322A88EC302920B47116862676C61B9" xlink:to="lab_us-gaap_CostOfServicesDirectTaxesAndLicensesCosts_3322A88EC302920B47116862676C61B9" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingInsuranceAndClaimsCostsProduction_E30C20A6AEDB3076B3016862676C50EE_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingInsuranceAndClaimsCostsProduction_E30C20A6AEDB3076B3016862676C50EE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Insurance and claims</link:label>
    <link:label id="lab_us-gaap_OperatingInsuranceAndClaimsCostsProduction_E30C20A6AEDB3076B3016862676C50EE_label_en-US" xlink:label="lab_us-gaap_OperatingInsuranceAndClaimsCostsProduction_E30C20A6AEDB3076B3016862676C50EE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Insurance and Claims Costs, Production</link:label>
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    <link:label id="lab_us-gaap_DirectCommunicationsAndUtilitiesCosts_9CBD6AABD5F8B38E35FD6862676C24DD_terseLabel_en-US" xlink:label="lab_us-gaap_DirectCommunicationsAndUtilitiesCosts_9CBD6AABD5F8B38E35FD6862676C24DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Communications and utilities</link:label>
    <link:label id="lab_us-gaap_DirectCommunicationsAndUtilitiesCosts_9CBD6AABD5F8B38E35FD6862676C24DD_label_en-US" xlink:label="lab_us-gaap_DirectCommunicationsAndUtilitiesCosts_9CBD6AABD5F8B38E35FD6862676C24DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Direct Communications and Utilities Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DirectCommunicationsAndUtilitiesCosts" xlink:label="loc_us-gaap_DirectCommunicationsAndUtilitiesCosts_9CBD6AABD5F8B38E35FD6862676C24DD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DirectCommunicationsAndUtilitiesCosts_9CBD6AABD5F8B38E35FD6862676C24DD" xlink:to="lab_us-gaap_DirectCommunicationsAndUtilitiesCosts_9CBD6AABD5F8B38E35FD6862676C24DD" xlink:type="arc" />
    <link:label id="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_33EDAD1CDE327FB8DF006862676C259D_verboseLabel_en-US" xlink:label="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_33EDAD1CDE327FB8DF006862676C259D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and amortization</link:label>
    <link:label id="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_33EDAD1CDE327FB8DF006862676C259D_label_en-US" xlink:label="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_33EDAD1CDE327FB8DF006862676C259D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">depreciation and amortization excluding depreciation on communication equipment</link:label>
    <link:label id="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_33EDAD1CDE327FB8DF006862676C259D_documentation_en-US" xlink:label="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_33EDAD1CDE327FB8DF006862676C259D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">depreciation and amortization excluding depreciation on communication equipment</link:label>
    <link:loc xlink:href="htld-20160930.xsd#htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment" xlink:label="loc_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_33EDAD1CDE327FB8DF006862676C259D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_33EDAD1CDE327FB8DF006862676C259D" xlink:to="lab_htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment_33EDAD1CDE327FB8DF006862676C259D" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherCostAndExpenseOperating_C419AD5EFE389912F6036862676C43C0_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCostAndExpenseOperating_C419AD5EFE389912F6036862676C43C0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other operating expenses</link:label>
    <link:label id="lab_us-gaap_OtherCostAndExpenseOperating_C419AD5EFE389912F6036862676C43C0_label_en-US" xlink:label="lab_us-gaap_OtherCostAndExpenseOperating_C419AD5EFE389912F6036862676C43C0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Cost and Expense, Operating</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherCostAndExpenseOperating" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_C419AD5EFE389912F6036862676C43C0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherCostAndExpenseOperating_C419AD5EFE389912F6036862676C43C0" xlink:to="lab_us-gaap_OtherCostAndExpenseOperating_C419AD5EFE389912F6036862676C43C0" xlink:type="arc" />
    <link:label id="lab_us-gaap_GainLossOnDispositionOfAssets_095752133DDF6779A9CA6862676CB903_negatedLabel_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets_095752133DDF6779A9CA6862676CB903" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Gain on disposal of property and equipment</link:label>
    <link:label id="lab_us-gaap_GainLossOnDispositionOfAssets_095752133DDF6779A9CA6862676CB903_label_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets_095752133DDF6779A9CA6862676CB903" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets_095752133DDF6779A9CA6862676CB903" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CostsAndExpenses_BBDB10751DC76CB7999A6862676CC906_totalLabel_en-US" xlink:label="lab_us-gaap_CostsAndExpenses_BBDB10751DC76CB7999A6862676CC906" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total operating expenses</link:label>
    <link:label id="lab_us-gaap_CostsAndExpenses_BBDB10751DC76CB7999A6862676CC906_label_en-US" xlink:label="lab_us-gaap_CostsAndExpenses_BBDB10751DC76CB7999A6862676CC906" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Costs and Expenses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_us-gaap_CostsAndExpenses_BBDB10751DC76CB7999A6862676CC906" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingIncomeLoss_A5779433106369784D136862676C6992_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_A5779433106369784D136862676C6992" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Operating income</link:label>
    <link:label id="lab_us-gaap_OperatingIncomeLoss_A5779433106369784D136862676C6992_label_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_A5779433106369784D136862676C6992" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Income (Loss)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_A5779433106369784D136862676C6992" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InvestmentIncomeInterest_B9B55C20C8BF2DFAE9616862676C0DBB_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentIncomeInterest_B9B55C20C8BF2DFAE9616862676C0DBB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest income</link:label>
    <link:label id="lab_us-gaap_InvestmentIncomeInterest_B9B55C20C8BF2DFAE9616862676C0DBB_label_en-US" xlink:label="lab_us-gaap_InvestmentIncomeInterest_B9B55C20C8BF2DFAE9616862676C0DBB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Income, Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="loc_us-gaap_InvestmentIncomeInterest_B9B55C20C8BF2DFAE9616862676C0DBB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InterestExpenseDebt_62777E1192F7413F2B9E6862676CCD34_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_InterestExpenseDebt_62777E1192F7413F2B9E6862676CCD34" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Interest expense</link:label>
    <link:label id="lab_us-gaap_InterestExpenseDebt_62777E1192F7413F2B9E6862676CCD34_label_en-US" xlink:label="lab_us-gaap_InterestExpenseDebt_62777E1192F7413F2B9E6862676CCD34" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Expense, Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InterestExpenseDebt" xlink:label="loc_us-gaap_InterestExpenseDebt_62777E1192F7413F2B9E6862676CCD34" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_3B65A465B8587B24836A6862676C8662_totalLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_3B65A465B8587B24836A6862676C8662" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Income before income taxes</link:label>
    <link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_3B65A465B8587B24836A6862676C8662_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_3B65A465B8587B24836A6862676C8662" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_3B65A465B8587B24836A6862676C8662" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetsCurrentAbstract_E70DF9C0DF92B4DB58A1446A357A031E_label_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_E70DF9C0DF92B4DB58A1446A357A031E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current [Abstract]</link:label>
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    <link:label id="lab_us-gaap_DeferredTaxAssetsNetCurrent_8E00BD512075B39F55EA446A357ACBE7_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNetCurrent_8E00BD512075B39F55EA446A357ACBE7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred income taxes, net</link:label>
    <link:label id="lab_us-gaap_DeferredTaxAssetsNetCurrent_8E00BD512075B39F55EA446A357ACBE7_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsNetCurrent_8E00BD512075B39F55EA446A357ACBE7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Assets, Net of Valuation Allowance, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DeferredTaxAssetsNetCurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetCurrent_8E00BD512075B39F55EA446A357ACBE7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredTaxAssetsNetCurrent_8E00BD512075B39F55EA446A357ACBE7" xlink:to="lab_us-gaap_DeferredTaxAssetsNetCurrent_8E00BD512075B39F55EA446A357ACBE7" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetsCurrent_72A8B941766B72771938446A357AE68E_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_72A8B941766B72771938446A357AE68E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current assets</link:label>
    <link:label id="lab_us-gaap_AssetsCurrent_72A8B941766B72771938446A357AE68E_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_72A8B941766B72771938446A357AE68E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_72A8B941766B72771938446A357AE68E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrent_72A8B941766B72771938446A357AE68E" xlink:to="lab_us-gaap_AssetsCurrent_72A8B941766B72771938446A357AE68E" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetsNoncurrentAbstract_0597961045090CF45B88446A357AB7FC_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsNoncurrentAbstract_0597961045090CF45B88446A357AB7FC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets, Noncurrent [Abstract]</link:label>
    <link:label id="lab_us-gaap_AssetsNoncurrentAbstract_0597961045090CF45B88446A357AB7FC_label_en-US" xlink:label="lab_us-gaap_AssetsNoncurrentAbstract_0597961045090CF45B88446A357AB7FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Noncurrent [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsNoncurrentAbstract" xlink:label="loc_us-gaap_AssetsNoncurrentAbstract_0597961045090CF45B88446A357AB7FC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_C6B203F964286119CDA9446A357AAC0E_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_C6B203F964286119CDA9446A357AAC0E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PROPERTY AND EQUIPMENT</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_C6B203F964286119CDA9446A357AAC0E_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_C6B203F964286119CDA9446A357AAC0E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Gross [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGrossAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_C6B203F964286119CDA9446A357AAC0E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGrossAbstract_C6B203F964286119CDA9446A357AAC0E" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentGrossAbstract_C6B203F964286119CDA9446A357AAC0E" xlink:type="arc" />
    <link:label id="lab_us-gaap_LandAndLandImprovements_BDF5BD6AB80574686F80446A357A4098_terseLabel_en-US" xlink:label="lab_us-gaap_LandAndLandImprovements_BDF5BD6AB80574686F80446A357A4098" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Land and land improvements</link:label>
    <link:label id="lab_us-gaap_LandAndLandImprovements_BDF5BD6AB80574686F80446A357A4098_label_en-US" xlink:label="lab_us-gaap_LandAndLandImprovements_BDF5BD6AB80574686F80446A357A4098" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Land and Land Improvements</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LandAndLandImprovements" xlink:label="loc_us-gaap_LandAndLandImprovements_BDF5BD6AB80574686F80446A357A4098" xlink:type="locator" />
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    <link:label id="lab_us-gaap_BuildingsAndImprovementsGross_69FC077488A4827EFE22446A357A8597_terseLabel_en-US" xlink:label="lab_us-gaap_BuildingsAndImprovementsGross_69FC077488A4827EFE22446A357A8597" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Buildings</link:label>
    <link:label id="lab_us-gaap_BuildingsAndImprovementsGross_69FC077488A4827EFE22446A357A8597_label_en-US" xlink:label="lab_us-gaap_BuildingsAndImprovementsGross_69FC077488A4827EFE22446A357A8597" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Buildings and Improvements, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BuildingsAndImprovementsGross" xlink:label="loc_us-gaap_BuildingsAndImprovementsGross_69FC077488A4827EFE22446A357A8597" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BuildingsAndImprovementsGross_69FC077488A4827EFE22446A357A8597" xlink:to="lab_us-gaap_BuildingsAndImprovementsGross_69FC077488A4827EFE22446A357A8597" xlink:type="arc" />
    <link:label id="lab_us-gaap_LeaseholdImprovementsGross_77835900F7743C0F034D446A357A415F_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsGross_77835900F7743C0F034D446A357A415F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leasehold improvements</link:label>
    <link:label id="lab_us-gaap_LeaseholdImprovementsGross_77835900F7743C0F034D446A357A415F_label_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsGross_77835900F7743C0F034D446A357A415F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Leasehold Improvements, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LeaseholdImprovementsGross" xlink:label="loc_us-gaap_LeaseholdImprovementsGross_77835900F7743C0F034D446A357A415F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseholdImprovementsGross_77835900F7743C0F034D446A357A415F" xlink:to="lab_us-gaap_LeaseholdImprovementsGross_77835900F7743C0F034D446A357A415F" xlink:type="arc" />
    <link:label id="lab_us-gaap_FurnitureAndFixturesGross_310937D03BE308947883446A357AE553_terseLabel_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesGross_310937D03BE308947883446A357AE553" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Furniture and fixtures</link:label>
    <link:label id="lab_us-gaap_FurnitureAndFixturesGross_310937D03BE308947883446A357AE553_label_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesGross_310937D03BE308947883446A357AE553" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Furniture and Fixtures, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FurnitureAndFixturesGross" xlink:label="loc_us-gaap_FurnitureAndFixturesGross_310937D03BE308947883446A357AE553" xlink:type="locator" />
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    <link:label id="lab_us-gaap_MachineryAndEquipmentGross_81C5DA923AD938C5C181446A357A41F1_terseLabel_en-US" xlink:label="lab_us-gaap_MachineryAndEquipmentGross_81C5DA923AD938C5C181446A357A41F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shop and service equipment</link:label>
    <link:label id="lab_us-gaap_MachineryAndEquipmentGross_81C5DA923AD938C5C181446A357A41F1_label_en-US" xlink:label="lab_us-gaap_MachineryAndEquipmentGross_81C5DA923AD938C5C181446A357A41F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Machinery and Equipment, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MachineryAndEquipmentGross" xlink:label="loc_us-gaap_MachineryAndEquipmentGross_81C5DA923AD938C5C181446A357A41F1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MachineryAndEquipmentGross_81C5DA923AD938C5C181446A357A41F1" xlink:to="lab_us-gaap_MachineryAndEquipmentGross_81C5DA923AD938C5C181446A357A41F1" xlink:type="arc" />
    <link:label id="lab_htld_RevenueEquipment_A50CACFC9374A809DA3A446A357A0B31_terseLabel_en-US" xlink:label="lab_htld_RevenueEquipment_A50CACFC9374A809DA3A446A357A0B31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue equipment</link:label>
    <link:label id="lab_htld_RevenueEquipment_A50CACFC9374A809DA3A446A357A0B31_label_en-US" xlink:label="lab_htld_RevenueEquipment_A50CACFC9374A809DA3A446A357A0B31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">REVENUE EQUIPMENT</link:label>
    <link:label id="lab_htld_RevenueEquipment_A50CACFC9374A809DA3A446A357A0B31_documentation_en-US" xlink:label="lab_htld_RevenueEquipment_A50CACFC9374A809DA3A446A357A0B31" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Carrying amount at the balance sheet date for long lived physical assets used in the normal conduct of business and not intended for resale.  Revenue equipment includes tractors and trailers used for purposes of providing transportation services.</link:label>
    <link:loc xlink:href="htld-20160930.xsd#htld_RevenueEquipment" xlink:label="loc_htld_RevenueEquipment_A50CACFC9374A809DA3A446A357A0B31" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_htld_RevenueEquipment_A50CACFC9374A809DA3A446A357A0B31" xlink:to="lab_htld_RevenueEquipment_A50CACFC9374A809DA3A446A357A0B31" xlink:type="arc" />
    <link:label id="lab_us-gaap_ConstructionInProgressGross_6F62C2E79C0098A7BDEE446A357A46AB_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionInProgressGross_6F62C2E79C0098A7BDEE446A357A46AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Construction in progress</link:label>
    <link:label id="lab_us-gaap_ConstructionInProgressGross_6F62C2E79C0098A7BDEE446A357A46AB_label_en-US" xlink:label="lab_us-gaap_ConstructionInProgressGross_6F62C2E79C0098A7BDEE446A357A46AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Construction in Progress, Gross</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_E8AD1F5B7C4FB9F2D942446A357A5D4B_totalLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_E8AD1F5B7C4FB9F2D942446A357A5D4B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Gross</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_E8AD1F5B7C4FB9F2D942446A357A5D4B_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_E8AD1F5B7C4FB9F2D942446A357A5D4B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_E8AD1F5B7C4FB9F2D942446A357A5D4B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_E8AD1F5B7C4FB9F2D942446A357A5D4B" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentGross_E8AD1F5B7C4FB9F2D942446A357A5D4B" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_954118F471BAA0E317E9446A357AAD86_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_954118F471BAA0E317E9446A357AAD86" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Less accumulated depreciation</link:label>
    <link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_954118F471BAA0E317E9446A357AAD86_label_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_954118F471BAA0E317E9446A357AAD86" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_804B0C38B108AC3BF22C446A357AA1A9_totalLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_804B0C38B108AC3BF22C446A357AA1A9" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Property and equipment, net</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_804B0C38B108AC3BF22C446A357AA1A9_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_804B0C38B108AC3BF22C446A357AA1A9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_804B0C38B108AC3BF22C446A357AA1A9" xlink:type="locator" />
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    <link:label id="lab_dei_EntityFilerCategory_2B7FCC92396FAC20A7756862673ABE99_label_en-US" xlink:label="lab_dei_EntityFilerCategory_2B7FCC92396FAC20A7756862673ABE99" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Filer Category</link:label>
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    <link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_65652A0F4F591E67CD79446A355B57C8_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_65652A0F4F591E67CD79446A355B57C8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
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    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_1D721ADB6BA7F6E45372446A355BA3DE_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_1D721ADB6BA7F6E45372446A355BA3DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of stock-based compensation, net of tax</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_B0BD1F08EB7A98F0DCC8446A355BFD70_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_B0BD1F08EB7A98F0DCC8446A355BFD70" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_408A196D3F0DDE8A88FB446A355B8A1D_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_408A196D3F0DDE8A88FB446A355B8A1D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sale of property and equipment</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_D19A1B85704C4ACE318C446A355BEE6B_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_D19A1B85704C4ACE318C446A355BEE6B" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchases of property and equipment, net of trades</link:label>
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    <link:label id="lab_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_26E5A374A78856065B8A446A355B496A_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromDelayedTaxExemptExchange_26E5A374A78856065B8A446A355B496A" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Change in designated funds for equipment purchases</link:label>
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    <link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_4C7DA3DC84DBA1086FF6446A355BC75B_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_4C7DA3DC84DBA1086FF6446A355BC75B" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Change in other assets</link:label>
    <link:label id="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_4C7DA3DC84DBA1086FF6446A355BC75B_label_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_4C7DA3DC84DBA1086FF6446A355BC75B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for (Proceeds from) Other Investing Activities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_030B41BDB988AE40AEE5446A355B054C_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_030B41BDB988AE40AEE5446A355B054C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used in investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_030B41BDB988AE40AEE5446A355B054C_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_030B41BDB988AE40AEE5446A355B054C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
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