An analytical model is suggested which estimates the statistics of delay to drivers who arrive randomly at an uncontrolled junction and wait to cross a major stream. The complexity of the problem does not allow all the details of the real crossing process to be taken into account in the model. Some simplifying assumptions are therefore made in the analysis concerning the probability distribution of the first "gap" encountered by the waiting driver and the independence between certain distributions. Using thorough simulation, the effects of these assumptions on the estimated average delay have been investigated in the case of a cumulative Erlang distribution for the gap acceptance function, an Erlang distribution for the move-up time, and a gamma distribution for the major stream headways. The mean delay estimated by the analytical model was always well within 5 per cent of the value obtained by simulation, and the two values were usually almost equal. These results support the simplifying assumptions of the analytical model and suggest that it gives a satisfactory estimate of delay. For the covering abstract of the symposium see TRIS 452544. (Author/TRRL)

Media Info

  • Features: Figures; References;
  • Pagination: p. 292-230

Subject/Index Terms

Filing Info

  • Accession Number: 00452558
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0 8020 2461 0
  • Files: ITRD, TRIS
  • Created Date: Jul 31 1986 12:00AM