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年平均日交通量).ppt

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,Density&SpeedStudiesandCharacteristicsVolume(rateofflow)---intensityoftrafficmovementSpeed---motionconditionDensity---distributionoftrafficflowoverspaceRelationshipamongthreeparameters------isdefinedasthenumberofvehiclesthatpassapointonahighway,oragivenlaneordirectionofahighway,duringaspecifiedtimeinterval,(AverageAnnualDailyTraffic年平均日交通量)AAWT(AverageAnnualWeekdayTraffic年平均工作日交通量)ADT(AverageDailyTraffic平均日交通量)AWT(AverageWeekdayTraffic平均工作日交通量)ThesefourvolumesremainatmacroscopiclevelDailyvariationfactor(DF)---isdefinedasratioofAADToveryearlyaveragevolumeforparticulardayofweek(Monday,Tuesdayetc.)CalibrationofDailyVariationFactorsDayYearlyAverageVolumeforDay(vehs/day)DailyAdjustmentFactorDFMonday1,8201,430/1,820=,5881,430/1,588=,4061,430/1,406=,3001,430/1,300=,2891,430/1,289=,2751,430/1,275=,3321,430/1,332=,010EstimatedAADT1,430Monthlyvariationfactor(MF)---isdefinedasratioofAADToverADTforparticularmonthoftheyearCalibrationofMonthlyVariationFactorsMonthTotalTraffic(vehs)ADTforMonth(veh/day)MonthlyVariationFactor(MF)January19,840/31=640797/640=,660/28=595797/595=,235/31=685797/685=,300/30=810797/810=,885/31=835797/835=,280/30=876797/876=,652/31=892797/892=,008/31=968797/968=,620/30=954797/954=,350/31=850797/850=,290/30=743797/743=,731/31=701797/701=,851AADT=290,851/365=797veh/dayHourlyvolumesandpeakhourvolume(小时流量,高峰小时流量)Hourlyvolumesareusedtoreflectvariation(fluctuation)oftrafficvolumeinadayPeakhourvolumeisdefinedasthevolumeinthesinglehourthathasthehighesthourlyvolumeRateofflow(流率)---definedasanequivalenthourlyvolumeforagiveninterval(intervalcanbe5,10,15minutes)usedindesigntoreflecttheworstscenariousedinmodelingmathematicalrelationshipam

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