civl - CIVL 3610 - Traffic and Transportation Engineering...

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CIVL 3610 - Traffic and Transportation Engineering ASSIGNMENT 2 Traffic Flow Fundamentals QUESTION 1 Assuming a linear speed-density relationship, the mean free speed on a highway facility lane equals 55 mph near zero density, and the jam density is observed to be about 200 veh/mi. Assume that the average length of vehicles is 20 ft. 1) Plot the q - k - v curves in proper order. 2) Write down the speed-density and flow-density equations. 3) Comment on the maximum flow. 4) Compute speeds and densities corresponding to a flow of 900 veh/hr, describing traffic conditions from a driver's point of view. 5) Calculate average headway, gap, clearance, and spacing at maximum flow and at jam density. Discuss all the results you obtain. Are they realistic? QUESTION 2 Greenberg has proposed the following speed-density ( v - k ) model for a traffic stream on one lane of a highway: vk = 30 300 ln( ) ( k is in vehicles/mile and v is in mile/hour). 1) Sketch the v - k relationship clearly and mention the obvious disadvantage of the model.
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This note was uploaded on 03/15/2012 for the course CIVL 000 taught by Professor Kk during the Spring '10 term at HKUST.

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