CALCULATION OF THE SPEED DEPENDENCE OF FLOW AND RELATION TO ROAD QUALITY

BERAEKNING AV TRAFIKHASTIGHETENS FLOEDESBEROENDE VID KVALITETSBESTAEMNING AV VAEGAR

This report describes a flow model, by which the reducing effects of traffic on average speeds can be calculated. The scope of the model is limited to two-lane roads outside built up areas and does not take crossings and environment into consideration. The speed adjustment of road users to the flow is primarily influenced by traffic density. This relation is of a simpler nature than the relation between speed and flow and has been used for calculation by stages, as the relation between speed and flow can be deduced from the relation between speed and density. By use of the flow model only the average speed over distances between 4 and 8 km, characterized by sight distribution, cross section and surfacing, can be calculated. /TRRL/

• Corporate Authors:

  Swedish National Road and Transport Research Institute (VTI)

  Linköping,   Sweden  SE-581 95
• Authors:
  • Kolsrud, B
• Publication Date: 1977

Language

• Swedish

Media Info

• Features: Figures; References; Tables;
• Pagination: 63 p.

Subject/Index Terms

• TRT Terms: Average travel speed; Cross sections; Highways; Mathematical models; Motor vehicles; Physical distribution; Rural areas; Speed; Surfacing; Traffic density; Traffic flow; Traffic speed; Two lane highways; Vision
• ITRD Terms: 5409: Average speed; 6404: Cross section; 9016: Distribution (gen); 2755: Highway; 6473: Mathematical model; 328: Rural area; 2972: Surfacing; 673: Traffic concentration; 671: Traffic flow; 2066: Vision
• Subject Areas: Freight Transportation; Highways; Operations and Traffic Management; I71: Traffic Theory;

Filing Info

• Accession Number: 00164370
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Rpt. No. 97
• Files: ITRD, TRIS
• Created Date: Feb 16 1978 12:00AM