Transcription of TRAFFIC STREAM CHARACTERISTICS
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TRAFFIC STREAM CHARACTERISTICS
TRAFFIC STREAM CHARACTERISTICSBY FRED L. HALL 4 Professor, McMaster University, Department of Civil Engineering and Department of Geography, 1280 Main Street West,4 Hamilton, Ontario, Canada L8S 2 - Frequently used Symbolskdensity of a TRAFFIC STREAM in a specified length of roadLlength of vehicles of uniform lengthcconstant of proportionality between occupancy andkdensity, under certain simplifying assumptionskthe (average) density of vehicles in substream Iiqthe average rate of flow of vehicles in substream Ii average speed of a set of vehiclesAA(x,t) the cumulative vehicle arrival function overspace and timekjam density, the density when TRAFFIC is so heavy thatjit is at a complete standstillufree-flow speed, the speed when there are nofconstraints placed on a driver by other vehicles on theroad STREAM CHARACTERISTICSThis chapter describes the various models that have beendevelopments in measurement procedures.
effect on the material to be covered in this chapter. conducted simultaneously with the data acquisition. 2.1.1 Measurement at a Point Measurement at a point, by hand tallies or pneumatic tubes, was the first procedure used for traffic data collection. This method is easily capable of providing volume counts and therefore flow
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