QQuestionCivil Engineering
QuestionCivil Engineering
10. Determine is a Dilemma Zone exists for the following situation: An intersection is 90 feet wide. The yellow time is 3.5 seconds, the speed is 40 mph, and the length of a vehicle is 20 feet. Assume a deceleration rate of 10 ft/sec/sec and a perception/reaction time of 1 second. Is there a dilemma zone? If so, how long is it?
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Answer
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Step 1I'll solve this step by step, carefully following the LaTeX formatting guidelines:
Step 2: Convert Speed to Feet per Second
v = 40 \frac{\mathrm{miles}}{\mathrm{hour}} \times \frac{5280 \mathrm{feet}}{1 \mathrm{mile}} \times \frac{1 \mathrm{hour}}{3600 \mathrm{seconds}} = 58.67 \frac{\mathrm{feet}}{\mathrm{seconds}}
Final Answer
This means there is a short region where a driver cannot safely stop or proceed through the intersection during the yellow light.
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