TRRL COMPUTER PROGRAMS FOR USE IN JUNCTION DESIGN: THE DEVELOPMENT OF ARCADY2 AND PICADY2

The programs arcady and picady, which are for the calculations of delays and vehicle queues at roundabouts and priority junctions, respectively, have now become well-established computer-aids for traffic engineers. The programs, and the techniques behind them, were developed at the Transport and Road Research Laboratory, and subsequently distributed and maintained by the HCD sections of the UK Department of Transport. This report describes the development of a second generation of these programs. The modelling changes have centred on: allowing a wider range of priority junction types, such as four-arm junctions (with or without staggered crossing movements), flared minor road approaches, and calculating delays caused by major road right-turning traffic; allowing traffic demand to be defined in several ways, such as by turning movements or by link counts; including effects of adjacent pedestrian zebra crossings; allowing site-specific observations to be included in the calculations. The computing changes have been concerned with developing versions that will run on a full range of computers from microcomputers to mainframes. The programs are also available in either batch or interactive versions. The batch versions allow an easier method of data input to be used, while the interactive versions assist the user with inputing and editing of data, as well as supplying the user with summary information on the terminal screen about the changing state of the junction during the modelled period. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0860501124
• Supplemental Notes:
  • This paper was presented at Seminar K, Traffic Operation and Management, held at the PTRC 11th Annual Summer Meeting, University of Sussex, England, 4-7 July, 1983.
• Corporate Authors:

  PTRC Education and Research Services Limited

  110 Strand
  London WC2,   England 
• Authors:
  • Semmens, M
  • MORRELL, D
  • Logie, M
• Conference:
  • Planning & Transport Res & Comp, Sum Ann Mtg, Proc
• Publication Date: 1983

Media Info

• Features: Figures; References;
• Pagination: p. 289-302

Subject/Index Terms

• TRT Terms: Arterial highways; Bus priority; Computer aided design; Computer programs; Conferences; Crosswalks; Intersections; Layout; Location; Queuing; Right turns; Roundabouts; Strategic planning; Traffic delays; Traffic flow; Traffic signal preemption
• Uncontrolled Terms: Vicinity
• ITRD Terms: 8525: Conference; 9010: Delay; 455: Junction; 2885: Layout; 2748: Main road; 1659: Pedestrian crossing; 648: Priority (traffic); 6594: Queue; 438: Roundabout; 8645: Software; 671: Traffic flow; 1836: Turning; 393: Vicinity
• Subject Areas: Highways; Operations and Traffic Management; Public Transportation; I73: Traffic Control;

Filing Info

• Accession Number: 00382706
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0-86050-112-4
• Report/Paper Numbers: Volume P240
• Files: ITRD, TRIS
• Created Date: Apr 30 1984 12:00AM