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Please answer all the questions.. for question 1(a,b) I will upload the labs or I’ll just do them

University of Akron
Department of Civil Engineering
4300:466/566 Traffic Engineering
Course Examination
Spring, 2020
NAME:
(Open Book)
____________________________________________________________________________
Problem 1 (25%)
a. (2%) According to the Traffic Engineering class,
(1) List a topic that is more difficult to follow. Explain why.
(2) List a topic interesting to you. Explain how.
b. Describe (briefly) the three labs included in the Traffic Engineering class. Explain your role in
each lab (3%)
c. One vehicle is following another vehicle on a flat road and the clearance is 200 feet. The
reaction time is 1.5 seconds and the friction coefficient 0.5. What would be the maximum safe
speed for the two vehicles? (4%)
c. An increase in intersection volume can be handled by adding more signal phases. Do you
agree/disagree – explain. (4%)
d. How would speed and yellow time change intersection dilemma zone, respectively? (2%)
e. An urban freeway (three lanes in each direction) serves a rush hour travel demand with trucks
and recreational vehicles, and on this roadway ET = 2.5 and ER = 2.0. If there is a need to keep
the heavy vehicle adjustment factor not less than 0.85, how much truck traffic (in percentage)
should be allowed after we know there are 3% recreational vehicles? (4%)
f. If traffic counts taken from an urban road on a Tuesday in March is 4500 vehicles, and in
general Tuesday’s traffic represents 110% of the daily average of the week, and March has 105%
of the average monthly traffic of the year, what will be the adjusted AADT for this road? (4%)
g. Field data show that the 15-min volume on a major urban expressway for one hour is 1600,
1400, 1750, and 1500, respectively. What is the current Peak Hour Factor (PHF) at this roadway
section? (2%)
Problem 2 (15%)
The following spot speeds were measured from vehicles on University Avenue:
Speed (mph)
Frequency
30
5
28
4
25
1
35
7
43
10
38
10
Determine
a) time-mean speed
(2%)
b) space-mean speed (3%)
c) 85-percentile speed and the 15-percentile speed (10%)
50
6
Problem 3 (15%)
A hazardous material spill on Interstate I-76 caused the eastbound traffic 20-minute delay.
Traffic flow is completely shut down on a three-lane section creating a jam density of
160vpm/lane. If the arriving flow on this roadway section is 3300vph at a density of 35 vpm/lane,
determine the following:
a) total number of vehicles in the queue and the queue length (miles) after 20 minutes (5%)
b) spacing (in ft/veh) between vehicles in the jammed traffic (5%)
c) if the roadway is re-opened after 20 minutes and the releasing flow at the bottleneck is
1800vph at a density of 60vpm, how long will it take for the releasing wave (moving
upstream from the bottleneck) to catch up with the jam density shockwave? (5%)
Problem 4 (20%)
a. Willow and Stevens are two-way streets in an urban area. A four-phase operation is used
for the intersection of Willow and Stevens with a cycle time of 110 seconds, including 15
sec Green for the left turn (LT) vehicles on each street. If the green time for the through
(TH) vehicles on Willow is 30 sec, determine the green time for the through (TH)
vehicles on Stevens and construct the signal timing cut-out diagrams (discussed in class)
for vehicles only without considering pedestrians. Assume a clearance (Yellow 3 sec +
All Red 2 sec) time of 5 seconds when the green light is switched between Willow and
Stevens (but do not use the clearance time when the signal changes from LT to TH on the
same street. (10%)
b. The width of Stevens Avenue is 52 feet. How long should be the Flash Don’t Walk
(FDW) duration if the walking speed of pedestrians is 4 feet/sec? (5%)
c. If the minimum headway is 2 sec, delay per phase is 4.6 sec, and there are two through
lanes and one left-turn lane on Willow in each direction, how long should be the cycle
time if the combined (LT + TH) traffic volume on this street is 3000 vehicles/hour? (5%)
Problem 5 (10%)
One section of an arterial street includes three intersections with a speed limit of 40 mph and a
common cycle time of 80 seconds.
a. The signal offset of the 1st intersection is set at 20 sec and its green time is 35 sec. The
distance between the 1st and 2nd intersections is 450 feet, for coordinating the two
intersections what should be the offset for 2nd intersection? (5%)
b. The distance from the 2nd intersection and 3rd intersection is 240 feet. If we want to start
the green signals for these two intersections at the same time in each cycle, at least how
long should the green time be set at the 3rd intersection to obtain a minimum green
bandwidth of 25 sec? (5%)
Problem 6 (15%)
Three intersections are working as a coordinated system in which the cycle time = 70 sec, where
Offset is the time difference between start of full green to the reference time. Other details are
shown below.
Intersection
1
2
3
4
Green/red split (%)
60/40
50/50
60/40
50/50
Offset (sec)
0
24
54
30
Cumulative distance (feet)
0
1500
3000
4000
a. sketch (draw) the green/red times and offsets to show if there exists any green bandwidth
from intersection 1 to 4 and vice versa (5%)
b. Perform a two-way balanced signal progression design by using the procedure discussed
in class. Calculate the bandwidth and show the updated offsets for each intersection (no
need to draw the bandwidth). (10%)
...

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