VEHICLE SPEEDS AND PATHS AT RURAL DIAMOND ROUNDABOUT MOTORWAY INTERCHANGES

Two flyunder and one flyover versions of this type of interchange were subjected to detailed study by the University of Nottingham. Flow conditions corresponded to level of service a. With the low convergence angles and long direct taper acceleration lanes provided, most of the acceleration to merging speed occurred on the slip road, leaving the acceleration lane to provide only the necessary merging distance. Similarly exiting vehicles largely postponed deceleration until they had entered the slip road. Both these characteristics were particularly pronounced in the flyunder designs where visibility is improved and gravity assists speed changes. (A). /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00410683
• Corporate Authors:

  Printerhall Limited

  29 Newmart Street
  London W1P 3PE,   England 
• Authors:
  • Ackroyd, L W
  • Madden, A J
• Publication Date: 1975-5

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 215-219
• Serial:
  • Traffic Engineering & Control
  • Volume: 16
  • Issue Number: 5
  • Publisher: Hemming Group, Limited
  • ISSN: 0041-0683
  • Serial URL: http://www.tecmagazine.com/

Subject/Index Terms

• TRT Terms: Acceleration lanes; Access roads; Cloverleaf interchanges; Deceleration; Diamond interchanges; Freeways; Level of service; Mathematical models; Mechanical acceleration; Merging traffic; Motor vehicles; Roundabouts; Rural areas; Rural highways; Speed; Traffic circles; Traffic flow; Traffic lanes; Traffic speed; Vehicle dynamics; Vehicles
• Uncontrolled Terms: Vehicle path
• Old TRIS Terms: Cl verleaf junction
• ITRD Terms: 5405: Acceleration; 435: Access road; 1057: Air transport network; 414: Cloverleaf junction; 5416: Deceleration; 6473: Mathematical model; 647: Merging traffic; 2752: Motorway; 438: Roundabout; 328: Rural area; 5408: Speed; 2827: Traffic lane
• Subject Areas: Highways; Operations and Traffic Management; Planning and Forecasting; Vehicles and Equipment; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00127776
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Dec 3 1975 12:00AM