Microcomputer Capabilities for Trip Table Estimation and Peak Hour Assignments which Consider Peak Spreading

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by Earl R. Ruiter, Cambridge Systematics, Inc, United States,

Document Type: Proceeding Paper

Part of: Microcomputer Applications in Transportation III

Abstract: The microcomputer-based TRANPLAN transportation planning package has been expanded to include a trip table estimation procedure and an equilibrium traffic assignment model which simulates the peak spreading phenomenon on congested highway links. The trip table estimation procedure provides a means to adjust vehicle trip tables to match screenline traffic counts without changing the relative numbers of trip origins and destinations in internal analysis zones. The peak spreading network equilibrium procedure assigns peak period travel (typically three hours) to a highway network and estimates peak hour link volumes as a function of link congestion levels. The relationship between the peak hour/peak period fraction and the volume/capacity ratio on congested facilities has been estimated as a decreasing function of volume/capacity ratio with a lower limit of one-third. Additional aspects of the subject are discussed.

Subject Headings: Travel patterns | Traffic models | Traffic analysis | Computer software | Traffic congestion | Equilibrium | Traffic assignment | Transportation networks |

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