Question

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)

Answer #1

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...

At the signalized intersection, the vehicles began to arrive
from 7:00 am (beginning of the traffic study) at the rate of 6
veh/min for 20 minutes, and declined to 1 veh/min. The traffic
signal is assumed to have an effective red and green only starting
from red at 7:00 am. The length of the effective green is 4 minutes
and effective red time is 3 minutes per cycle. The discharge rate
of the vehicles on effective green is 6 veh/minute....

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.

7.34 At one signalized intersection approach, 20
vehicles, on average, arrive during the 30-second
effective green time. During the rest of the cycle, 45
vehicles, on average, arrive at the intersection from this
approach. The cycle length is 90 seconds. What is the
proportion of vehicles arriving on green for this
approach?

1. On one approach of an intersection with fixed time traffic
signal, vehicles arrival rate is 600 vehicles per hour. The
effective green time for this approach is 30 seconds, the
saturation flow of this approach is 1800 vehicles per hour and the
cycle time of the intersection is 80 seconds.
a. Evaluate the performance of the signal design i.e. will all
vehicles clear during the green time?
b. Recommend the changes to the green time for this approach to...

A traffic signal has a 90-second cycle length. For the travel
direction of interest, the red and green times are 30 seconds and
60 seconds, respectively, the arrival rate is constant at 30
veh/min and the saturation flow (i.e., the queue discharge rate) is
1 veh/sec.Calculate the total delay [veh.s] for the travel
direction of interest. What is the maximum queue size [veh]?

A certain lane group in a pre-timed signalized intersection has
a volume-to-capacity ratio of 0.8. If the cycle length is 80
seconds, you are required to calculate the minimum effective green
time that must be allocated for that lane group to ensure that the
uniform delay is less than 8 seconds per vehicle.

A traffic signal operates with a 60 seconds cycle length. On the
Eastbound approach, traffic arrives at a constant rate of 20
vehicles/minute. The saturation flow is 1 vehicle/second. The
effective green time is 30 seconds. Calculate the following:
a. The degree of saturation (v/c ratio)
b. The capacity on the approach
c. The spare capacity (%)
d. The average delay to all vehicles

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