Question

Traffic on the eastbound approach of a signalized intersection is traveling at 48 km/h, with a density of 51 veh/km/ln. The duration of the red signal indication for this approach is 38 sec. If the jam density is 131 veh/km/ln, determine the length (in meters) of the queue at the end of the red phase to one decimal place accuracy.

Answer #1

An approach to a signalized intersection has a saturation flow
rate of 1800 veh/h. At the beginning of an effective red, there are
6 vehicles in queue and vehicles arrive at 900 veh/h. The signal
has a 60-second cycle with 25 seconds of effective red. What is the
total vehicle delay after one cycle? What is the maximum length of
queuing within this cycle? (assumeD/D/1 queuing)

An isolated pretimed signalized intersection has an approach
with a traffic flow rate of 750 veh/h and a saturation flow rate of
3200 veh/h. This approach is allocated 32 seconds of effective
green time. The cycle length is 100 seconds. Determine the average
approach delay (using Eq. 7.27).
A) 34.8 s
B) 30.2 s (incorrect)
C) 35.0 s
D) 4.6 s

Vehicles arrive in a single approach for two consecutive cycles
at a signalized intersection. The signal has a 60 second cycle time
which consists of a 30 second green interval and a 30 second red
interval (ignore yellow interval). The arrival rates are assumed to
be constant in both cycles. The arrival rate was 1,080
vehicles/hour in the first cycle and it decreased to 720
vehicles/hour in the second cycle. Assume that all vehicles in the
queue formed on red...

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