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University Avenue is an arterial connecting two regional centers of a large metropolitan area. A
signal progression study is to be undertaken for eight intersections starting from the one with
University and Snelling. The signal cycle lengths are all 60 sec with a uniform green split of
60/40% favoring the University Avenue. The speed limit is 30 mph. Draw a time-space diagram
by adopting horizontal scale 1" = 600' for distance and vertical scale of 1" = 40 sec of time.
(1) Is there a green bandwidth for moving through all the intersections in each traffic
direction with the initial Offsets shown below?
To improve the signal coordination, you need to develop a balanced progressive signal control
plan. If the same cycle length, green splits, and speed limit are to be maintained, calculate and
draw a new time-space diagram based on the results of the balanced progressive plan with the
center of the green interval at Snelling adopted as the bench-mark.
(2) What is the maximum bandwidth in BOTH traffic directions after the improvement?
(3) Mark the reference line and show the new offsets as a result of the signal progression
improvement. Show the green time and red time at each intersection based on the new
offsets and draw the green band in both directions. (Note: it is OK to draw the green band
only for a couple of cycles and for a few intersections if you do not have more time to
draw the entire picture.)
Distance between Street
Total = 5680 feet