THE EFFECT OF LANE SIGNALLING ON THE TRAFFIC FLOW OF URBAN HIGHWAYS

AUSWIRKUNGEN DER FAHRSTREIFENSIGNALISIERUNG AUF DEN VERKEHRSABLAUF AUF STADTSTRASSEN

A STRETCH OF 5 KM LENGTH OF THE HEERSTRASSE IN WEST BERLIN WAS FITTED WITH LANE MARKING SIGNALS IN 1970/71. THE MAIN CARRIAGEWAY HAS FIVE LANES. BECAUSE OF THE VARYING AND OFTEN UNSYMMETRICAL TRAFFIC LOAD THE FLEXIBLE ASSIGNMENT OF TWO OR THREE LANES SHOULD ADAPT THE TRAFFIC CAPACITY TO THE PREVAILING TRAFFIC LOAD AND PROVIDE GOOD TRAFFIC QUALITIES. THE DESIRED OBJECTIVES WERE GENERALLY ACHIEVED; EXTENSION TO TWO CARRIAGEWAYS EACH OF THREE LANES COULD BE AVOIDED. THE EFFECT OF THE SIGNALLING PROCESS ON THE TRAFFIC FLOW OF THE WHOLE SYSTEM IS DESCRIBED. IT WAS POSSIBLE TO DERIVE THE RECOMMENDATION THAT THE CENTRE LANE SHOULD BE ASSIGNED TO THE PREVAILING LOAD DIRECTION WHEN THE LOAD RATIO REACHES 1.3:1 AT A TOTAL LOAD OF 350 VEHICLES PER 15 MIN. THE MAIN PROBLEM WAS SEEN TO BE THE LEFT TURN, ESPECIALLY AT PEAK HOURS WITH LANE DIVISION OF 3:2 OR 2:3 WITHOUT WIDENING AT THE INTERSECTIONS. OPERATIONAL MEASURES SUCH AS THE PROHIBITION OF LEFT TURNS, RIGHT TURNS WITH BLOCK LOOPING AND LANE DIVISION OF 2:X:2 (I.E. USE OF CENTRE LANE FOR WAITING WHEN TURNING LEFT) ARE DISCUSSED. REFERENCE IS MADE TO EXPERIENCE WITH SIMILAR SCHEMES IN MUNICH, DUSSELDORF, HAMBURG AND THE USA. FINALLY THERE IS A WARNING AGAINST MAKING OTHER ALTERATIONS TO TRAFFIC SIGNALS AND JUNCTION LAYOUT WHEN INTRODUCING THE LANE SIGNALLING SYSTEM AND THEREBY TO MAKE EXCESSIVE DEMANDS ON MOTORISTS. A GRADUAL INTRODUCTION OF MEASURES WHICH INFLUENCE TRAFFIC FLOW WILL ALSO SERVE TO REDUCE THE DANGER OF ACCIDENTS.

  • Availability:
  • Authors:
    • Wehner, B
    • BURMEISTER, P
    • Leichter, K
    • SCHWENCKE, K R
  • Publication Date: 1975

Language

  • German

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01303280
  • Record Type: Publication
  • Source Agency: Forschungsgesellschaft für Straßen- und Verkehrswesen (FGSV)
  • Files: ITRD
  • Created Date: Nov 21 2010 9:00AM