Question

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

Answer #1

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]?

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)

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...

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

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....

Sign In
INNOVATION
Deep Change: How Operational Innovation Can Transform Your
Company
by
Michael Hammer
From the April 2004 Issue
Save
Share
8.95
In 1991, Progressive Insurance, an automobile insurer based in
Mayfield Village, Ohio, had approximately $1.3 billion in sales. By
2002, that figure had grown to $9.5 billion. What fashionable
strategies did Progressive employ to achieve sevenfold growth in
just over a decade? Was it positioned in a high-growth industry?
Hardly. Auto insurance is a mature, 100-year-old industry...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 43 minutes ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago

asked 3 hours ago

asked 3 hours ago

asked 4 hours ago

asked 4 hours ago

asked 4 hours ago

asked 5 hours ago