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Engineering

Civil Engineering

what is the estimated space-mean speed of these vehicles?

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter6: Fundamental Principles Of Traffic Flow

Section: Chapter Questions

Problem 5P

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Concept explainers

Capacity and Level of Service at Intersections

The term capacity is associated with transportation engineering. Capacity helps to understand how many pedestrians or vehicles can be handled by a transport facility. Level of service is also a term associated with transportation engineering. The level of service indicates the performance of the transport facility.

Question

A section of Texas Highway 83 (Tx83) has a free-flow speed of 55 mph and a capacity of 3,300 vehicles per hour. At 8 am, 2,100 vehicles were counted using a 6 ft by 6 ft inductive loop. If the linear speed-density relationship applies, what is the estimated space-mean speed of these vehicles?

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A flow characteristic that is related to the density and obtained from speed data is occupancy. Data obtained from a 6-ft by 6-ft inductive loop detector is used to determine the traffic density. With an occupancy of 9.375%, determine the density, in vehicles per mile, for a mean vehicle length of 27 feet.
3. A section of a highway is known to have a free-flow speed of 55mph and a capacity of 3300 veh/hr. In a given hour, 2100 vehicles were counted at a specified point along this highway section. If the linear speed-density relationship applies, what would you estimate the space mean speed of these 2100 vehicles be?
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