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ID:26875315
大小:5.57 MB
页数:15页
时间:2018-11-29
《accessibility(机动性和可达性)》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、1.4BasicConceptsinTrafficEngineeringMobilityversusAccessibility(机动性和可达性)HighwayClassification(道路分类)Uninterrupted(连续流)andInterrupted(间断流)flowsResponsibilityandLiability(责任与义务)TransportationLegislation(交通立法)Mobility(机动性)---referstotheabilitytotraveltomanydifferentdestinations,whileacc
2、essibility(可达性)---referstotheabilitytogainentrytoaparticularsiteorareaWithanincreaseofmobilitytheabilitytoaccessdevelopmentdecreases,andviseversa.MobilityversusAccessibilityGraphicdescriptionbetweenmobilityandaccessibilityHighwayclassificationLocation--urbanandsuburban(rural)Criteri
3、on---specificationforroadwaydesignEachcountryhasdifferentwayindetermininghierarchyofhighwaysThepurposeofconductingclassificationforhighwayistoclarifythefunctionalityofeachcategoryofroadwaysinprovidingservicesintermsofmobilityandaccessibilityWithincreaseofmobilitytheaccessibilitywill
4、decreaseFreewayhasthehighestmobility;whereaslocalstreethasthehighestaccessibilityFreewaysorexpressways---access-controlled,multilane,dividedhighwaysdevotedtohigh-speed,long-distancetravelwithlittleornoaccessadjacenttolandArterials---roadwaysservingprimarilytomovetrafficbetweenprinci
5、paltrafficgeneratorswithpartiallyaccess-controlled(residentialaccessisdiscouraged,butcommercialaccessisallowed),therearetwocategories:majorandminorCollectors---roadwaysservinginternaltrafficmovementswithinanurbanareaandconnectingitwiththearterialsystem,therearetwocategories:majorand
6、minorLocalstreets---primarilyprovidingaccesstothedevelopmentwithlow-speedUninterruptedandInterruptedflowsUninterruptedflow(连续流)facilitieshavenoexternalinterruptions(外部干扰)tothetrafficstream.Pureuninterruptedflowexistsmainlyonfreewaysandexpressways.Interruptedflow(间断流)facilitieshaveex
7、ternalinterruptionstothetrafficstream.Almostallurbansurfacestreetsandhighwaysareinterruptedflowfacilities.Uninterruptedflowfacilitiesarefullyorpartiallyaccess-controlledFreewayinGermany(2008)ExpresswayinBeijing(2007)Interruptedflowfacilitiesarenotaccess-controlled,withexternaldisrup
8、tions,resultinginst
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