CAPACITY OF MERGING AREAS ON URBAN MOTORWAYS

DRIVER BEHAVIOR WAS STUDIED AT FOUR URBAN SITES IN THE UK WHERE AN ENTRANCE SLIP ROAD JOINED A MOTORWAY, OR JOINED AN URBAN ROAD AT A GRADE SEPARATED INTERCHANGE. THE SITES WERE SUCH THAT TRAFFIC FLOWS WERE HIGH ENOUGH AT CERTAIN TIMES TO CAUSE CONGESTION. THE PATH OF EVERY VEHICLE WAS TRACED AND SPEEDS, HEADWAYS ETC. OBTAINED BY TIME-LAPSE CINEMATOGRAPHY IN WHICH EACH SITE WAS FILMED AT A RATE OF TWO FRAMES PER SECOND. THE FILM WAS ANALYZED BY COMPUTER. MULTIPLE REGRESSION WAS USED TO OBTAIN AN EQUATION FOR INSIDE LANE FLOW IN TERMS OF TOTAL UPSTREAM FLOW, SLIP ROAD FLOW, RELATIVE GRADIENT AND NUMBER OF LANES. A LESS RELIABLE EQUATION TO PREDICT MERGE CAPACITY IN TERMS OF INSIDE LANE FLOW AND SPEED IS DERIVED. /TRRL/

  • Availability:
  • Authors:
    • Berresford, M R
    • SEDDON, P A
  • Publication Date: 1972-6

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Filing Info

  • Accession Number: 00228453
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Jun 5 2000 12:00AM