FUNDAMENTAL OF TRAFFIC FLOW

BASIC TRAFFIC STREAM MODEL

FLOW = SPEED x DENSITY (q = uk)

SPEED – DENSITY MODEL FLOW – DENSITY MODEL SPEED – FLOW MODEL FLOW-DENSITY, SPEED – DENSITY, AND SPEED-DENSITY MODEL

ROAD TRAFFIC SYSTEM

- ROAD USERS- VEHICLES- ROAD NETWORK

FACTOR

Physical – perception and vision

Environmental

- Weather & lighting- Traffic volumes- Road geometry

Psychological

- Motive of journey- emotion

Traffic Flow – number of vehicles (n) passing in given time interval (t)

Q = n/t

Density – the number of vehicles occupying a given length of a lane or roadway at a particular instant.

Headway – The time (in seconds) between successive vehicles, as their front bumpers pass a given point .

NICKLOS BIN JEFRIN

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TRAFFIC ENGINEERING

Speed – distance travelled per unit time

Spot speed – instantaneous speed of a vehicle passing a point on the roadway.

Journey speed – distance divided by total journey time.

Running speed – distance divided by running time

Time mean speed – arithmetic mean of all instantaneous vehicle speed at a given point on a roadway section

Space mean speed – the mean travel speed of vehicles tranversing a roadway segment of a known distance