LANE-BY-LANE MODELLING OF UNEQUAL LANE USE AND FLARES AT ROUNDABOUTS AND SIGNALISED INTERSECTIONS: THE SIDRA SOLUTION

This paper was written in response to two papers by Chard [IRRD 889956] and by Simmonite and Moore [IRRD 890826] on the approach method of traffic modelling, which combines traffic in the individual lanes of an approach to a junction. It discusses important aspects of these papers from the viewpoint of the lane-by-lane method used in the SIDRA software package. The SIDRA method for analysing roundabout capacity and performance is described; it is an extension of traditional gap acceptance and queueing techniques. There is a brief discussion of short-lane modelling in SIDRA, followed by a discussion of various results for the signalised intersection example with short lanes (flares) given in the second paper. The effects of flow patterns and traffic signal timings on short-lane capacity prediction are shown to be important by SIDRA results for random and platooned arrivals, and by signal timings under different control conditions: isolated and coordinated fixed-time, and vehicle-actuated. Some important extensions of traffic signal analysis methods, introduced in the latest version of SIDRA (Version 5), are emphasised. It is also emphasised that iterative methods, using external tools, are inefficient solutions for practical use by traffic engineers and planners.

• 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:
  • AKCELIC, R
• Publication Date: 1997

Language

• English

Media Info

• Features: References;
• Pagination: p. 388-99
• Serial:
  • Traffic Engineering & Control
  • Volume: 38
  • Issue Number: 7/8
  • Publisher: Hemming Group, Limited
  • ISSN: 0041-0683
  • Serial URL: http://www.tecmagazine.com/

Subject/Index Terms

• TRT Terms: Computer programs; Decision making; Highway capacity; Intersections; Mathematical models; Methodology; Queuing; Roundabouts; Stochastic processes; Traffic; Traffic flow; Traffic lanes; Traffic signals; Vehicle spacing
• ITRD Terms: 643: Capacity (road, footway); 2248: Decision process; 455: Junction; 6473: Mathematical model; 9102: Method; 6594: Queue; 438: Roundabout; 8645: Software; 6574: Stochastic process; 755: Traffic; 671: Traffic flow; 2827: Traffic lane; 565: Traffic signal; 694: Vehicle spacing
• Subject Areas: Data and Information Technology; Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00743061
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Nov 26 1997 12:00AM