Dilemma Zone. Drivers on Lincoln Street approaching Douglas Street do so at 25 mph. Douglas Street is 50 feet “deep.” when measured from farside curb line to nearside stop bar. The yellow phase on Lincoln is 4 seconds long. Using a reaction time of 2 seconds, a deceleration rate of 10 ft/sec2, and a vehicle length of 15 feet, answer the questions below.
(a) Is there a dilemma zone?
(b) Show your calculations for xr, xb, xy, etc.
(c) Also sketch the street section and show the key distance components you calculate.
(d) Regardless of your answer to part a, let us say there is a dilemma zone of length 45 feet. How much all-red or extra yellow time will be needed to eliminate it?
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