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ID:47273260
大小:47.50 KB
页数:14页
时间:2019-08-25
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1、HighwayTypesAllstatehighwaysystemsandmostofthelocalhighwayandstreetsystemsencompassseveraltypeorclassesofhighway.Atoneextremearehigh-speed,high-volumefacilitiescarryingthoughtraffic,withnoattemptmadetoserveabuttingpropertyorpurelylocaltraffic.Attheotherarelocalrural
2、roadsorstreetsthatcarrylowvolumes,sometimesatlowspeeds,andwithaprimaryfunctionoflandservice.Definitionsforthevarioustypesofhighways(andformanyotherhighwayterm)werepreparedin1968byan(then)AASHOSpecialcommitteeonNomenclature.ThesearepublishedasAASHOHighwayDefinitions.
3、someoftheseareasfollows:Expressway-Dividedarterialhighwayforthoughtrafficwithfullorpartialcontrolofaccessandgenerallywithgradeseparationsatmajorintersection.Freeway-Expresswaywithfullcontrolofaccess.Parkway-Arterialhighwayfornoncommercialtraffic,withfullorpartialcon
4、trolofaccess.andusuallylocatedwithinaparkoraribbonofparklikedevelopment.Controlofaccess–Conditionwheretherightofowneroroccupantsofabuttinglandorotherpersonstoaccess.light,air,orviewinconnectionwithahighwayisfullorpartiallycontrolledbypublicauthority.Fullcontrolofacc
5、essmeansthattheauthoritytocontrolaccessisexercisedtogivepreferencetothoughtrafficbyprovidingaccessconnectionswithselectedpublicroadsonlyandbyprohibitingcrossingsatgradeordirectprivatedrivewayconnections.Partialcontrolofaccessmeansthattheauthoritytocontrolaccessistog
6、ivepreferencetothoughtraffictodegreethat.inadditiontoaccessconnectionswithselectedpublicroads,theremanybesomecrossingsatgradeandsomeprivatedrivewayconnections.Theotherhighwaytypeslackthefeatureofaccesscontrol.theyinclude:Majorstreetormajorhighway–Arterialhighwaywith
7、inintersectionsatgradeanddirectaccesstoabuttingproperty,andonwhichgeometricdesignandtraffic–controlmeasuresareusedtoexpeditethesafemovementofthoughtraffic.Thoughstreetorthoughhighway–Everyhighwayorportionthereofonwhichvehiculartrafficisgivenpreferentialrightofway,an
8、dattheentrancestowhichvehiculartrafficfromintersectinghighwaysisrequiredbylawtoyieldrightofwaytovehiclesonsuchthroughhighwayinobediencetoe
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