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Final_09_mock

Final_09_mock - Department of Civil Engineering CE...

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Department of Civil Engineering Spring 2009 CE 4211/5211 Traffic Engineering Dr. Henry Liu 1 Name: Student ID: Final Exam 1. Consider the following two spot speed samples conducted a test location to determine the effectiveness of a new speed limit posting at 50mph. Before After Average Speed 55.3mph 52.8mph Standard Deviation 5.0mph 5.6mph Sample Size 100 85 a. Was the new speed limit effective in reducing average speeds at this location? b. Was the new speed limit effective in reducing average speeds to 50mph?

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Spring 2009 CE 4211/5211 Traffic Engineering Dr. Henry Liu 2 2. Studies have shown that the traffic flow on a single-lane approach to a signalized intersection can be described by the Greenshields model. If the jam density on the approach is 130veh/mile, determine the velocity of the stopping shockwave when the approach changes to red if the density on the approach is 45veh/mile and the space mean speed is 40mph. At the end of the red interval, what length of the approach upstream from the stop line will vehicles be affected if the red interval is 35seconds?
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Final_09_mock - Department of Civil Engineering CE...

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