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1.VolumeSomeusefulvolumes//Dailyvariationfactor(DF)---isdefinedasratioofAADToveryearlyaveragevolumeforparticulardayofweek(Monday,Tuesdayetc.)Monthlyvariationfactor(MF)---isdefinedasratioofAADToverADTforparticularmonthoftheyearHourlyvolumesandpeakhourvolume（小时流量(liúliàng)，高峰小时流量(liúliàng)）Hourlyvolumesareusedtoreflectvariation(fluctuation)oftrafficvolumeinadayPeakhourvolumeisdefinedasthevolumeinthesinglehourthathasthehighesthourlyvolumeRateofflow(流率）---definedasanequivalenthourlyvolumeforagiveninterval(intervalcanbe5,10,15minutes)usedindesigntoreflecttheworstscenariousedinmodelingmathematicalrelationshipamongparametersinresearchgenerallytheshortertheintervalthehighertherateofflowIntervalVolumeIntervalVolume7:00–7:05157:30–7:35177:05–7:10257:35–7:40357:10–7:15187:40–7:45287:15–7:20427:45–7:50327:20–7:25317:50–7:55267:25–7:30187:55–8:0020Peakhourfactor（高峰小时(xiǎoshí)系数）---isdefinedastheratioofhourlyvolumedividedbymaximumrateofflowThe30thhourlyvolume(第30位小时(xiǎoshí)交通量)---definedasanhourlyvolumeatwhichitsrankingonyearly-countingcurvecounts30thamong8760hourlyvolumesinayearDDHV(DirectionalDesignHourlyVolume设计小时(xiǎoshí)流量)---DDHV=AADTⅹKⅹDwhere:Kisproportionofdailytrafficoccurringduringthepeakhour,expressedasadecimal;Disproportionofpeak-hourtraffictravelinginthepeakdirection,expressedasadecimalD=ratioofdesignhourvolumeinthemajordirectiontothetotal(方向性系数(xìshù)）/VMT(VehicleMilesTraveled=车英里(yīnglǐ))orVKT(VehicleKilometersTraveled车公里)---definedasaproductofnumberofvehiclesandmiles(orkilometer)traveledbythesevehiclesPCEandPCU（小汽车当量(dāngliàng)）---definedasthenumberofpassengercarsdisplacedbyonetruck,bus,orRVinagiventrafficstreamTrafficintensitycanbeusedascriteriontodeterminepassengercarequivalent2.SpeedTMSisapointmeasure,whileSMSisameasurerelatingtoalengthofhighwayorlaneSMSisoftenusedintrafficflowtheorystudyatmacroscopiclevelwhileTMSisusedforengineeringstudyTMS≥SMSAveragetravelspeedandaveragerunningspeed（平均(píngjūn)行程，行驶速度)---Averagetravelspeed=distance/traveltime
