Traffic engineering and control 

About: Traffic engineering and control is an academic journal. The journal publishes majorly in the area(s): Traffic flow & Poison control. It has an ISSN identifier of 0041-0683. Over the lifetime, 1395 publications have been published receiving 14768 citations.

Metanet: a macroscopic simulation program for motorway networks

Abstract: A dynamic simulation tool for traffic engineering problems in motorway networks, including multiple origins, multiple destinations and alternative routes, is presented. The basic equations of purely macroscopic modelling approach are explained and the input requirements are briefly described. Accuracy of simulation results is examined on the basis of real-life measurements from an example network in the South of Paris.

The scoot on-line traffic signal optimisation technique

Abstract: Many large cities have, or plan to have, urban traffic control (utc) systems that centrally monitor and control the traffic signals in their jurisdiction. The present generation of utc systems usually co-ordinates the signals on fixed-time plans, which consist of sets of timings that determine when each signal turns red and green. The plans are precalculated to suit average conditions during each part off the day (e.g. A.M. peak) and do not respond to variations in flows in the network. Since 1973 the UK Transport and Road Research Laboratory has been researching a vehicle responsive method of signal control called SCOOT (split, cycle and offset optimisation technique). Research was carried out in Glasgow by a small team from TRRL and the Ferranti, GEC and Plessey traffic companies, with assistance from Strathclyde Regional Council. In 1976 the success of the research phase led to a development project between the departments of transport and of industry and the three traffic companies. TRRL continued research into SCOOT and in 1979 carried out a full-scale trial of SCOOT in Glasgow. As part of the development project, and with the co-operation of West Midlands County Council, SCOOT was installed in Coventry. A further full-scale trial of the developed system was carried out in 1980. This paper describes the SCOOT system and the results of the trials which compared SCOOT with up-to-date fixed-time systems. It is concluded that SCOOT reduced vehicle delay by an average of about 12 percent during the working day. The surveys demonstrate that scoot rapidly adapts to unusual traffic conditions as well as to the usual variations in demand that occur throughout the day and night. It is an important benefit of SCOOT that there is no need to periodically prepare new fixed-time plans and that the signal timings are automatically kept up-to-date. The traffic model in SCOOT provides real-time information on flows and queues and is likely to be a key element in the development of new traffic management strategies that make the best overall use of roads in urban areas. This paper is a shortened version of TRRL Report LR 1014 (see TRIS 348845). This paper was presented at the IEE's Conference on Road Traffic signalling, Londong, March 1982. See also TRIS abstracts 368871 and 368872. (TRRL)

"transyt" method for area traffic control

Abstract: THE TRANSYT (TRAFFIC NETWORK STUDY TOOL) DIGITAL COMPUTER PROGRAM, ITS TRAFFIC MODEL AND OPTIMIZATION ROUTINE ARE DESCRIBED. THE CRITERION OF PERFORMANCE USED IS THE MINIMUM AVERAGE JOURNEY TIME; THE GREATEST BENEFITS CAN BE DERIVED FROM THE METHOD WHEN IT IS APPLIED TO DENSE SIGNAL NETWORKS WHERE THE DISTANCE BETWEEN INTERSECTIONS IS INFERIOR TO 750 FT. RESULTS OF THE CROMWELL ROAD EXPERIMENT AND GLASGOW EXPERIMENT ARE PRESENTED AND DISCUSSED. /RRL/

A model for traffic simulation

Abstract: The impairment to man and environment by a steadily increasing traffic volume requires concrete solutions now more urgently than ever before. This problem can, however, only be coped with from a scientific point of view, when founded knowledge exists of the very complex interconnections of the system called 'traffic'. Regarding the enormous costs of experimental investigations undertaken to influence traffic purposefully, the significance of theoretical considerations prior to necessary field-tests can easily be seen. This paper will not only illustrate the development of such a model of traffic simulation, but also show first results thereof.

Saturn - a modern assignment model

Abstract: Saturn (simulation and assignment of traffic to urban road networks) is a computer model for the analysis and evaluation of traffic management schemes over relatively localised networks. It serves, in effect, as a highly-sophisticated traffic assignment model. It was first described in Traffic Engineering & Control in April 1980 and more recently, in brief, in July/August 1982. This article updates these previous ones by describing recent improvements to the model: two levels of network description to enable wide-ranging impacts to be studied; fuel consumption estimates; explicit bus routes; a correct treatment of over-capacity junctions; a quasi-dynamical assignment facility; graphical outputs; interactive analysis via a vdu; plus a number of miscellaneous improvements. (Author/TRRL)