Principles of Highway Engineering and Traffic Analysis (5th Edition) Textbook Solutions Chapter 5 Problem 1

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Solution

Finding Traffic Flow
Find the traffic flow q using the formula:



Where,  is average time headway.

put 3.2 sec for :



Hence, the value of traffic flow is 1125 veh/hr.
Finding Average Traffic Speed
Fine the average traffic speed u using the formula:



Where,  is average spacing.

Now put 165 ft for value of :



Hence, the value of average traffic speed is 35.15 mi/hr.
Finding Traffic Density
Find the traffic density k using the formula:



Put  for q and  for u:



Hence, the value of traffic density is 32 veh/mi.

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