THE OPTIMAL TIME SETTING OF THE GREEN LIGHT SIGNAL IN THE PELICAN CROSSING CYCLE

At the present time the Department of the Environment recommendation for the green light interval is 30 or 40 seconds, this time remaining fixed for all flow rates. A computer simulation study is described, which was carried out to determine whether or not there was a case for varying this signal setting according to the different levels of pedestrian and vehicle flows occurring during the day. Graphs are presented of total vehicle flow rate (veh/h) against total pedestrian flow rate (ped/h) for a range of conditions. From this work it is suggested that there is a case to be made for designing a pelican crossing to be sensitive to the size of pedestrian and vehicle flow rates. However, the curves indicate that the results are not highly dependent on pedestrian flow rates, and that as a compromise measure, it would be possible to use vehicle flow rate alone, as at most traffic signal situations, in order to vary the length of the green light interval. /TRRL/

  • Availability:
  • Corporate Authors:

    Printerhall Limited

    29 Newmart Street
    London W1P 3PE,   England 
  • Authors:
    • Cresswell, C
    • Griffiths, J D
    • Hunt, J G
  • Publication Date: 1977-5

Media Info

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Filing Info

  • Accession Number: 00174122
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jun 28 1978 12:00AM