quiz_1_cee3604_2011 solution

quiz_1_cee3604_2011 solution - Name Signature CEE 3604...

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CEE 3604: Introduction to Transportation Engineering Fall 2011 Exam 1 (Solution) Problem 1 (40) A traffic engineer collects data at a busy section of highway 23. The highway has 4 lanes - two per side. The data collected for one lane is plotted in Figure 1. The engineer suspects Greenberg’s model applies to the traffic situation. Figure 1. Collected Traffic Data. a) Do you agree with the engineer’s view that Greenberg’s model may apply. Briefly explain. Yes the data suggests a symmetric parabola is not a good fit. Greenberg’s model seems a better fit. b) Assuming Greenberg’s traffic flow model applies, find the speed of the traffic for maximum flow ( c ). By inspection the density for maximum flow is 29 veh/km-lane. The speed for maximum flow is 60 km/hr. c) Write down the equation for Greenberg’s traffic flow model for the data shown in Figure 1. In your equation include the numerical values for Greenberg’s two model parameters: a) jamming concentration ( k j ) and b) speed for maximum flow ( c ). No points will be given if you just write the general Greenberg equation model without numerical values for k j and c .
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