Estimate the jam density in one lane of trucks, Civil Engineering

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At a large port facility near New York City tractor-trailer trucks are lined-up in long queues as their drivers wait to have their containers inspected and documents processed.  Assume the trucks have an average length of 73.5 ft and the average space between the rear and front bumpers of successive vehicles is 10 feet. What is the best estimate for the "jam density" (trucks/mile) in one lane of trucks?


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