This article describes an enhancement to the TRAF-NETSIM simulation model, a Fortran-based program modelling the operational performance of vehicles, travelling in a network of surface streets. In this model, each vehicle is categorised and its performance determined uniquely every second. The enhancement provides an ability to model, with traffic streams exhibiting identical routeing patterns, driver-vehicle and other characteristics through a series of runs. The user can thus make a series of simulation runs by retaining the traffic stream of an initial run and varying traffic control, volume or other operational conditions during subsequent runs. The generation of stochastic behaviour and the need to generate identical traffic streams is discussed. Two approaches are considered and program modifications are described. The selected approach is based on using the vehicle-specific random number seeds to generate identical traffic streams from one run to the next. These number seeds are generated from a 'base' random number seed. Some representative simulation results are presented and the applications and limitations of the identical traffic streams feature are examined.

  • Availability:
  • Corporate Authors:

    Printerhall Limited

    29 Newmart Street
    London W1P 3PE,   England 
  • Authors:
    • Rathi, A K
    • Santiago, A J
  • Publication Date: 1990-6


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00606996
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS, ATRI
  • Created Date: Mar 31 1991 12:00AM