ROUNDABOUT CAPACITY

THIS PAPER PRESENTS THE RESULTS OF INVESTIGATIONS CARRIED OUT AT FIVE ROUNDABOUTS, AND SHOWS HOW TRAFFIC BEHAVIOUR IS RELATED TO THE HIGHWAY LAYOUT AT THESE SITES. THE ROUNDABOUTS TO THE NORTH EAST OF LONDON WERE INVESTIGATED AT TIMES OF HEAVY TRAFFIC FLOW USING TIME-LAPSE CINEPHOTOGRAPHY. THE EXPECTED FREQUENCY OF A GAP OF ANY SIZE APPEARING IN A SPECIFIED TRAFFIC STREAM IS PREDICTED. GRAPHS ILLUSTRATE THE GAP ACCEPTANCE CHARACTERISTICS OF THE TRAFFIC AT EACH ENTRANCE TO THE ROUNDABOUTS. AN EMPIRICAL RELATIONSHIP BETWEEN THE ROUNDABOUT SHAPE AND MEASURED TRAFFIC FLOW PARAMETERS IS DERIVED, FROM WHICH AN ESTIMATE OF THE TRAFFIC CAPACITY OF EACH APPROACH ROAD TO A ROUNDABOUT CAN BE MADE. A SUGGESTED DESIGN METHOD USING THE RESULTS OF THIS SURVEY IS GIVEN.

• Corporate Authors:

  Institution of Municipal Engineers

  25 Eccleston Square
  London SW1 V1NX,   England 
• Authors:
  • WATSON, J P
• Publication Date: 1974-4

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 128-131
• Serial:
  • Institution of Municipal Engineers, Journal of
  • Volume: 101
  • Issue Number: 5

Subject/Index Terms

• TRT Terms: Access roads; Cinematography; Decision making; Highway capacity; Highway design; Mathematical models; Roundabouts; Traffic circles; Traffic flow; Vehicle spacing
• Geographic Terms: United Kingdom
• Old TRIS Terms: Lay-out
• ITRD Terms: 435: Access road; 643: Capacity (road, footway); 6752: Cinematography; 2248: Decision process; 2885: Layout; 6473: Mathematical model; 438: Roundabout; 8119: United Kingdom; 694: Vehicle spacing
• Subject Areas: Highways; Operations and Traffic Management; Planning and Forecasting; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00080691
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Mar 6 1975 12:00AM