THE CAPACITY OF MOTORWAY MERGES

Diagrams have been produced which may be used to determine which geometric arrangements of motorway merging areas are capable of carrying various combinations of entry and main carriageway flows at each of three design flow standards. These standards are taken from British sources, although considerable use has been made of American techniques and sources in the derivation of the diagrams. A method of compensating for variations in the traffic composition and for the effect of gradients is included. The flow levels given by these diagrams are much higher than those in current design guidance. However, comparisons with recorded flows show that the new levels are realistic. (A). /TRRL/

• Corporate Authors:

  Transport and Road Research Laboratory (TRRL)

  Wokingham, Berkshire  United Kingdom 
• Authors:
  • BURROW, I J
• Publication Date: 1976

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: 31 p.

Subject/Index Terms

• TRT Terms: Freeways; Highway capacity; Highway grades; Layout; Merging area; Merging traffic; Slopes; Standards; Traffic flow; Vehicle mix
• Geographic Terms: United Kingdom
• Old TRIS Terms: Capacity (Road,footway); Entering vehicles
• ITRD Terms: 643: Capacity (road, footway); 2806: Gradient; 2885: Layout; 647: Merging traffic; 2752: Motorway; 671: Traffic flow; 8119: United Kingdom
• Subject Areas: Highways; Operations and Traffic Management; Planning and Forecasting; I21: Planning of Transport Infrastructure; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00138928
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: TRRL LR 679
• Files: ITRD, TRIS
• Created Date: Oct 26 1976 12:00AM