Titlebook: Highway Traffic Analysis and Design; R. J. Salter Book 1989Latest edition Macmillan Publishers Limited 1989 environment.optimization.simul

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The macroscopic determination of speed and flow of a highway traffic streamthe speeds of, and headways between, individual vehicles have been used to obtain relationships for the whole traffic stream. An alternative approach to the determination of speed/flow relationships is the use of macroscopic relationships obtained by the observation of stream behaviour.

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The relationship between speed, flow and density of a highway traffic streamWhen considering the flow of traffic along a highway three descriptors are of considerable significance. They are the speed and the density or concentration, which describe the quality of service experienced by the stream; and the flow or volume, which measures the quantity of the stream and the demand on the highway facility.

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