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1、第五课TrafficEngineeringIntroduction交通工程学概论A.Text:TrafficEngineeringBasicsB.ReadingMaterial:HighwayCapacityTextTrafficEngineeringBasics1PredictionofTrafficVolumeGrowthTrafficvolumegrowthmaybepredictedusinganumberofmethodsbutthetwoprimaryonesaretheuseoftheARTSlong-rangeplanandman
2、ualmethods.TheARTSplanmaybeusedtoestablishaveragedailytrafficvolumesforstreetswithinastudyareaforafutureyearaspredictedbytheARTSmodel.Thisdatacanbeusedtodevelopafactortoapplytoexistingtrafficcountstopredictfuture-yeartrafficvolumes.Manualextrapolationofexistingdatausinggrowth
3、factorsmaybeavailablefromtheCity,ortheconsultantmayneedtodevelopthem.Growthfactorsmaybeandcanberepresentativeofanumberofalgebraictrends.Amongthesearethestraight-line,exponential,anddecaying-rateexponentialtrends.Foragooddiscussionofthesetrendmethods,seetheTripForecastingManua
4、lpublishedbytheFloridaDepartmentofTransportation.Generally,manualextrapolationofturningmovementcountswillnotbeacceptedforperiodsoftimeexceedingfiveyears.2TripGenerationEstimationTripgenerationmaybeestimatedusingtheInstituteofTransportationEngineers(ITE)TripGeneration.Anaccomp
5、anyingpublication,theTripGenerationHandbookprovidesadditionalinformationonhowtouseTripGenerationandhowtoapplyadjustmentssuchaspass-bytrips.Generally,theCityofAikenacceptsthemethodologyprovidedinTripGenerationandtheTripGenerationHandbook.Insomecases,tripgenerationdatamaynotbea
6、vailablefromITEforcertainlanduses.Inthesecasestheapplicant’sconsultantwillberequiredtodevelopestimatedtripgenerationdataforuseinthestudyafterconsultationwiththeCityofAikenstaff.TheTripGenerationprovidesestimatedtripgenerationdataforvariouslandusecategories,knownaslandusecodes
7、intheManual.Averageratesforweekdays,weekends,andmorningandafternoonpeakhoursaregivenformostlandusecodes.Inaddition,manyofthelandusecodesprovideequationsthatmaybeusedtodetermineestimatedtrafficgeneration.Anexampleofthedataforalanduse,Code210,single-familyresidential,isgivenont
8、hefollowingpage.Asseeninthisexample,thereareaverageratesaswellasaneq
