Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 6, Problem 5P
To determine
The occupancy, density, and flow rate.
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1. A study of speed-flow-density relationships at a particular site has resulted in the following calibrated equation and
graph 1:-
(a) Assuming a linear relationship, derive the equations depicting the relationship between flow and density and
speed and flow, for this site.
(b) How long will it take for the last vehicle queued during the red phase to clear once the light turns green?
Speed km/h
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0
20
ū = 71.2 (1-122)
Speed vs Density Curve
40
80
60
Density veh/km
GRAPH 1
100
120
140
A 12 ft long loop detector has observed six vehicles that have crossed the device in a 148 second period, for the following durations: 0.44; 0.48; 0.5; 0.41; 0.49; and 0.55. The six vehicles are 18, 21, 20, 23, 17 and 19 ft respectively.
a. How long is the total time for the detector to be occupied?
b. What is the % lane occupancy?
c. How many vehicles per mile density value, k?
d. How many miles per hour is the rated speed, v?
e. How many vehicles per hour current value, q?
A 12 ft long loop detector has observed six vehicles that have crossed the device in a 148 second period, for the following durations: 0.44; 0.48; 0.5; 0.41; 0.49; and 0.55. The six vehicles are 18, 21, 20, 23, 17 and 19 ft respectively.
Calculate:
b. What is the % lane occupancy?
Chapter 6 Solutions
Traffic and Highway Engineering
Ch. 6 - Prob. 1PCh. 6 - Prob. 2PCh. 6 - Prob. 3PCh. 6 - Prob. 4PCh. 6 - Prob. 5PCh. 6 - Prob. 6PCh. 6 - Prob. 7PCh. 6 - Prob. 8PCh. 6 - Prob. 9PCh. 6 - Prob. 10P
Ch. 6 - Prob. 11PCh. 6 - Prob. 12PCh. 6 - Prob. 13PCh. 6 - Prob. 14PCh. 6 - Prob. 15PCh. 6 - Prob. 16PCh. 6 - Prob. 17PCh. 6 - Prob. 18PCh. 6 - Prob. 19PCh. 6 - Prob. 20PCh. 6 - Prob. 21PCh. 6 - Prob. 22PCh. 6 - Prob. 23PCh. 6 - Prob. 24PCh. 6 - Prob. 25PCh. 6 - The arrival times of vehicles at the ticket gate...Ch. 6 - Prob. 27P
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