MACRO SPEED-FLOW MODEL FOR ON- AND OFF-RAMPS ON MULTILANE ROADS

The National Road Administration in Sweden has initiated a comprehensive research project concerning traffic on multilane roads. The name of the project is TPMA for Traffic Performance on Major Arterials. A model for four-lane road segments was presented in Copenhagen in 1998. Now a macro model for freeway on- and off-ramps has been developed. This model is based on traffic data from twelve interchanges with several measuring spots in each interchange. Normally in Sweden the on-ramps are not regulated by any give way regulations to the main stream; instead, there is an acceleration lane for the on-ramp. The model for influence of on-ramps on the main road traffic consists of three submodels: (1) Model for lane distribution of the vehicles downstream the on-ramp; (2) Model for lane capacity; and (3) Model for speed-flow relationship. For off-ramps a model has been developed for lane distribution of the vehicles just upstream the off-ramp. The flow in the right lane is estimated as a non-linear function of the total flow and the off-ramp flow.

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  http://onlinepubs.trb.org/onlinepubs/circulars/ec018/ec018toc.pdf
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  • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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  Transportation Research Board

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• Authors:
  • CARLSSON, A
  • CEDERSUND, H-A
• Conference:
  • Fourth International Symposium on Highway Capacity
  • Location: Maui, Hawaii
  • Date: 2000-6-27 to 2000-7-1
• Publication Date: 2000-6

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 142-154
• Serial:
  • Transportation Research Circular
  • Issue Number: E-C018
  • Publisher: Transportation Research Board
  • ISSN: 0097-8515

Subject/Index Terms

• TRT Terms: Flow speed relationships; Freeways; Highway capacity; Lane distribution; Multilane highways; Off ramps; On ramps; Traffic models
• Geographic Terms: Sweden
• Subject Areas: Highways; Operations and Traffic Management; Planning and Forecasting; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00795375
• Record Type: Publication
• Report/Paper Numbers: E-C018
• Files: NTL, TRIS, TRB
• Created Date: Jul 25 2000 12:00AM