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CEE 122
Traffic Engineering
Spring 2010
Homework #9
Due: __________________
1.
Plot the uq and qk curves and estimate the maximum flow rates (
m
q
) of the 2
common safe driving rules described below.
Use plotting range from 0 mph to 75
mph with an increment of 5 mph for u, and from 0 veh/mi/ln to 150 veh/mi/ln with
an increment of 10 veh/mi/ln for k.
a)
Maintain a 3 seconds separation with the vehicle in the front regardless of speed.
b)
Maintain a safe distance of one car length for every 10 MPH of speed, i.e., keep a
distance of 4 car lengths with the vehicle in front when traveling at 40 MPH; 5 car
lengths for 50 MPH.
Use car length L = 20 feet.
2.
Demand data of a freeway segment were collected and summarized in
the table to the right.
Times shown in the table are start times of each
15 minute time slice.
The capacity of this freeway segment was
determined to be 4400 veh/hr.
a)
Plot the queuing (cumulative vehicle
time) diagram.
b)
What was the maximum queue in number of vehicles?
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This note was uploaded on 09/08/2010 for the course BUS 190 at San Jose State University .
 '09
 Yu,Oliver

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