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        <link:definition>2107100 - Disclosure - Use of Estimates</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:element id="htld_AmortizationPeriodOfTires" name="AmortizationPeriodOfTires" nillable="true" substitutionGroup="xbrli:item" type="us-types:durationStringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_BasisofPresentationAbstract" name="BasisofPresentationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="htld_CommonStockDividendsDeclaredInAccountsPayable" name="CommonStockDividendsDeclaredInAccountsPayable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_CommunicationsAndUtilitiesExpenseMember" name="CommunicationsAndUtilitiesExpenseMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_ConsolidatedBalanceSheetsParentheticalsAbstract" name="ConsolidatedBalanceSheetsParentheticalsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="htld_DebtCovenantMinimumNetIncomeRequirement" name="DebtCovenantMinimumNetIncomeRequirement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="htld_DebtCovenantMinimumTangibleNetWorth" name="DebtCovenantMinimumTangibleNetWorth" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="htld_DebtInstrumentCovenantLeverageRatio" name="DebtInstrumentCovenantLeverageRatio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_DeiAbstract" name="DeiAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="htld_Depreciationandamortizationexcludingdepreciationoncommunicationequipment" name="Depreciationandamortizationexcludingdepreciationoncommunicationequipment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="htld_FairValueOfRevenueEquipmentTraded" name="FairValueOfRevenueEquipmentTraded" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_FinancialStatementLocationAxis" name="FinancialStatementLocationAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_FinancialStatementLocationDomain" name="FinancialStatementLocationDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="htld_IncreaseDecreaseinIntangibleAssetsNonCurrent" name="IncreaseDecreaseinIntangibleAssetsNonCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_IntangibleAssetsandGoodwillAbstract" name="IntangibleAssetsandGoodwillAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="htld_Lettersofcreditoutstandingonalineofcredit" name="Lettersofcreditoutstandingonalineofcredit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod2" name="LineofCreditFacilityMaximumBorrowingCapacityPeriod2" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="htld_LineofCreditFacilityMaximumBorrowingCapacityPeriod3" name="LineofCreditFacilityMaximumBorrowingCapacityPeriod3" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="htld_LineofCreditLongTermDebtAbstract" name="LineofCreditLongTermDebtAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="htld_Paymentsforpartsandservices" name="Paymentsforpartsandservices" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_PropertyPlantandDepreciationAbstract" name="PropertyPlantandDepreciationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="htld_Receiptsfortractorsales" name="Receiptsfortractorsales" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="htld_Receiptsfortrailersales" name="Receiptsfortrailersales" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_RelatedPartyAbstract" name="RelatedPartyAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_RelatedPartyMember" name="RelatedPartyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="htld_RentAndPurchasedTransportation" name="RentAndPurchasedTransportation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="htld_RestrictedStockSharesAuthorized" name="RestrictedStockSharesAuthorized" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="htld_RevenueEquipment" name="RevenueEquipment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="htld_SegmentInformationAbstract" name="SegmentInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="htld_SegmentInformationTextBlock" name="SegmentInformationTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_ShareRepurchasesAbstract" name="ShareRepurchasesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_StockBasedCompensationAbstract" name="StockBasedCompensationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="htld_StockRepurchaseShares" name="StockRepurchaseShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="htld_TerminalFacilitiesMember" name="TerminalFacilitiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_TractorsMember" name="TractorsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_TrailersMember" name="TrailersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_UseofEstimatesAbstract" name="UseofEstimatesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="htld_WeightedAverageSharesOutstandingAbstract" name="WeightedAverageSharesOutstandingAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="htld_Weightedaveragefairvaluepriceofstockawardslower" name="Weightedaveragefairvaluepriceofstockawardslower" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="htld_Weightedaveragefairvaluepriceofstockawardsupper" name="Weightedaveragefairvaluepriceofstockawardsupper" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
</xsd:schema>