THE EFFECT OF PELICAN CROSSINGS ON ROUNDABOUT ENTRY CAPACITY

This paper considers the effects of Pelican crossings, installed on roundabout arms, on the entry capacities of those arms and of the upstream arm. Formulae are given for calculating the capacity of a fixed-time Pelican crossing. They are applied to demonstrate situations in which the arm's entry capacity is limited by the Pelican's entry capacity. Pedestrian precedence periods at a Pelican crossing can restrict the entry of vehicles. A regression model, using data generated by a microscopic simulation model, is developed to quantify this effect for a special case. The paper evaluates the beneficial results of displacing the Pelican crossing away from the roundabout give-way line. It also considers the effects on upstream entry capacity of the blocking back of vehicles queueing at a Pelican crossing on the downstream arm. The calculations, presented in this paper, are similar to those used by the ARCADY3 package to calculate the reduction in entry capacity caused by a Zebra crossing near a roundabout entry. Some comparisons are made between the capacities of Zebra and Pelican crossings.

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  • Corporate Authors:

    INSTITUTION OF HIGHWAYS & TRANSPORTATION

    6 ENDSLEIGH STREET
    LONDON,   United Kingdom  WC1H 0DZ
  • Authors:
    • HUNT, J
    • JABBAR, J A
  • Publication Date: 1995-10

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 33-6
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00719873
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Apr 26 1996 12:00AM