Transportation Engineering. Lecture 8: Traffic Signal. Critical Lane & Time Budget. Critical Lane. This concept is used for the allocation of the 3600 seconds in the hour to lost time and to productive movement.
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Lecture 8: Traffic Signal
The cycle length is 40 sec, 2 phase cycle and saturation headway 2.3sec. What should be the lane numbers for each approach?
(volume-to-capacity) V/C ratio:
Peak Hour Factor (PHF):
Min. cycle length,
Desirable cycle length,
3 + 2 ERT = 17 or ERT = 7
In this situation, 1 RT vehicle is equivalent to 7 TH vehicles in terms of headway.
Example: consider an approach with 10% RT, two lanes, permitted RT phasing, a RT equivalency factor of 5, and an ideal saturation headway of 2 sec per veh. Determine
Delay most directly
stopped time + acceleration + deceleration
developed based on minimization of overall delay at intersection
Consider an approach volume of 1000 vph, saturation flow rate of 800vphg, cycle length 90 s and g/C ratio 0.55.
What average approach delay per vehicle is expected?