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Validation of Daganzo's Behavioral Theory of Mult-Lane Traffic Flow: Interim Report

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  • Banks, James

Abstract

This report documents results of work completed at San Diego State University during the first year of a research project intended to validate a behavioral traffic-flow theory recently proposed by Daganzo (1,2). Work on this project completed at the University of California at Berkeley will be documented in a separate interim report. In the idealized form developed so far, Daganzo’s theory assumes two types of drivers, aggressive (rabbits) and timid (slugs), and two lane groups, shoulder lanes and passing lanes. In free flow, rabbits travel faster than slugs and the two groups are segregated in what Daganzo terms two-pipe flow, with the slugs all in the shoulder lane and the rabbits all in the passing lane. In high-volume uncongested flow, rabbits will follow one another with very small headways, so long as they are able to pass, and such drivers are referred to as being motivated because the very small headways are held to be motivated by the desire to pass slower vehicles. Whenever an event occurs that reduces speed in the passing lane to (or below) vf, the free-flow speed in the shoulder lane, the rabbits change lanes to equalize speeds, lose their “motivation,” and increase their headways. This results in one-pipe flow. Because of the difference in the headways, maximum uncongested flow rates in the passing lane exceed the queue discharge rate for this lane. Daganzo provides solutions for a number of cases involving transitions from two-pipe to one-pipe flow and vice versa. These solutions are presented for the most part in terms of wave speeds and traffic states in, upstream, and downstream of queues.

Suggested Citation

  • Banks, James, 2002. "Validation of Daganzo's Behavioral Theory of Mult-Lane Traffic Flow: Interim Report," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt4p57p2tc, Institute of Transportation Studies, UC Berkeley.
  • Handle: RePEc:cdl:itsrrp:qt4p57p2tc
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    References listed on IDEAS

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    1. Daganzo, Carlos F., 1999. "A Behavioral Theory of Multi-Lane Traffic Flow Part II: Merges and the Onset of Congestion," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt3qj018c9, Institute of Transportation Studies, UC Berkeley.
    2. Daganzo, Carlos F., 1999. "A Behavioral Theory of Multi-Lane Traffic Flow Part I: Long Homogeneous Freeway Sections," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt8n96n91w, Institute of Transportation Studies, UC Berkeley.
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