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DENSITY-SPEED-FLOW DYNAMICS IN SINGLE LANE TRAFFIC FLOW. IN VEHICULAR TRAFFIC SCIENCE

Robert S. Foote, K W Crowley

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Abstract

Traffic flowing through a 6000-foot length of single-lane tunnel roadway, with a bottleneck at the output end, was observed simultaneously at the terminal points and 4 intermediate points under a variety of conditions. Output flow was observed to vary significantly, but as a consistent function of input flow, section density, and output speeds. A control on input flow based on output speeds, intended to maximize output flow, caused systematic oscillations in both input and output flow, section density, and output speed. A new control based on section density and input flow, as well as output speed, was tested. The behavior of gaps is described and the distribution of headway times is discussed.

About this research paper

What this paper is about

Traffic flowing through a 6000-foot length of single-lane tunnel roadway, with a bottleneck at the output end, was observed simultaneously at the terminal points and 4 intermediate points under a variety of conditions. Output flow was observed to vary significantly, but as a consistent function of input flow, section density, and output speeds. A control on input flow based on output speeds, intended to maximize output flow, caused systematic oscillations in both input and output flow, section density, and output speed. A new control based on section density and input flow, as well as output speed, was tested. The behavior of gaps is described and the distribution of headway times is discussed.

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Available abstract

Traffic flowing through a 6000-foot length of single-lane tunnel roadway, with a bottleneck at the output end, was observed simultaneously at the terminal points and 4 intermediate points under a variety of conditions. Output flow was observed to vary significantly, but as a consistent function of input flow, section density, and output speeds. A control on input flow based on output speeds, intended to maximize output flow, caused systematic oscillations in both input and output flow, section density, and output speed. A new control based on section density and input flow, as well as output speed, was tested. The behavior of gaps is described and the distribution of headway times is discussed.

Key concepts: Bottleneck, Traffic flow (computer networking), Flow (mathematics), Headway, Control theory (sociology), Mechanics, Simulation, Traffic wave

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