AboutOntheselectionofamotorwayinterchangeAbstract:Interchangeinterchangeroadisthemainhighwaynetworknodes,theselectionofamotorwayinterchangefunctionoftherelationshipbetweentheroadnetworkplaysakeyroletoplay.Interoperablenetworkselectionshouldmeettheplanningrequirements,itslocationandtypeisalsoamajorhighwayroutesintoconstraints.Abstract:Expresswayinterchangeisthemainnodeofexpresswaynetwork,anditsselectionplaysakeyroleinplayingthefunctionoftheroadnetwork.Selectionofinterchangeshouldmeettherequirementsofnetworkplanning,whileitslocationandtypeisalsoamajorconstraintstothetrendofhighwayroutes.Keywords:highway,interchange,selectionKeywords::expressway,interchange,selection1HighwayInterchangeinterchangedesignandanalysis1.1Interchangeinterchangedesigntrafficcapacityof1roadtrafficinterchangewiththemainpurposeistoimproveintersectiontrafficcapacity,reducetheinterferenceofcrosstrafficwhen,inordertoensuretrafficsafetyattheintersectionofroadsandfasttraffic.1.2InterchangedesignspeedofChina’sdesignspeedisdefinedas:theweatherisgood,asmallamountoftraffic,roadconditions,clean,mediumleveloftechnologydriverintherestrictedpartoftheroadtomaintainasafeandcomfortabledrivingthemaximumspeeddesigntheactualspeedisatheoreticalspeed,andvehicleoperatingspeedis85%ofactualspeed.1.3Therampinterchangerampdesignatafixeddesigntocontrolthespeedrampdesignspecifications,isinconsistentwiththevehicledrivingcharacteristics,resultinginsmoothrampcannotprovideappropriate,safe,economic,andsmooththerequirementsrampdesignspeedandroadThedesignspeedofthemainapplicationsinthedesignisnotthesame.mainlineathighwayspeedtocontroltheentirelineofdesignindicators(mainroaddesigndoesnotrequireadifferent2levelofspeedorcircumstances),toprovideafullrangeofsafe,comfortableride,whiletherampistoprovideaconnectiontothevehicleturningroad,rampdesignspeedinadditiontotherampitselfisdesignedtomeetthesecurity,economic,butalsotakeintoaccountthesmoothconnectionwiththeconnectingroad,whichistherampdesignspeedcannotbeusedtocontrolaspeedreasons.1.4Interchangedesignspeedofvariablespeedlanecross-sectionfromtheleftlanewithcurbs(sharedwiththemainlane,lane,rightshoulder(includingthecurbwiththerightcomposition.Dividedintodirectstyleandspeed-laneparallel,routespecificationstates:whenthespeedlanetolane,decelerationlaneshouldadoptdirect-type,parallelaccelerationlaneshouldbeadopted.speedlanetodoublelane,accelerationanddecelerationlanesshouldbeadirectstyle.Directstyleofthetraditionalpracticeofthedecelerationlaneistheoutsidelanefromthemaincenterinthemainlinewiththesamelinear(ingeneralto1/17.53to1/25outofangletogetout,outofreachinalanewidthofthestartingpointofthedecelerationlane,totheseparationofthemainline,theformationofthedecelerationlane.Themainadvantageofthisdesignmethodislinearflownaturally,inlinewiththevehiclerunningtrack,butnoteasytoidentifythedriveroutofposition,andinthedesignprocessisnoteasytocontrolthelengthofthedecelerationlaneisnowacommonlyuseddesignmethodsdirectlyfromthemaincarriagewayplusthewidthofalanebegan(ie,thedecelerationlanestartingfromthecenterofthelanebegantoflowacertainangleoutofthedecelerationlanepriortotheuseoflineargradient.Thisdecelerationlanedesigniseasytofindthedriveroutofposition,lengthofdecelerationlanedesigniseasytocontrol,butthatthereisalinearturningpoint.2thebasictypesofinterchangeInterchangetheinterchangeofbasictypesaredividedinto...