JOURNEY SPEED AND FLOW IN CENTRAL URBAN AREAS
AN EQUATION IS DERIVED RELATING THE AVERAGE SPEED ON A JOURNEY IN THE CENTRAL URBAN AREA TO AVERAGE VALUES OF THE FLOW OF TRAFFIC, THE WIDTH OF THE ROAD, THE NUMBER OF CONTROLLED INTERSECTIONS PER MILE, AND THE PROPORTION OF GREEN TIME. IT IS BASED ON OBSERVATIONS OF TRAFFIC IN CENTRAL LONDON AND STUDIES OF DELAY AT TRAFFIC SIGNALS WHICH HAVE BEEN REPORTED PREVIOUSLY. THE RESULTS SHOW THAT AN INCREASE IN THE NUMBER OF INTERSECTIONS PER MILE PRODUCES APPROXIMATELY THE SAME REDUCTION IN JOURNEY SPEED AT ANY LEVEL OF TRAFFIC FLOW. WITHIN THE USUAL RANGE OF ROAD WIDTH, THE JOURNEY SPEED FOR A GIVEN NUMBER OF INTERSECTIONS PER MILE IS LARGELY DETERMINED BY TRAFFIC INTENSITY, THAT IS, THE NUMBER OF CAR EQUIVALENTS (P. C. U. S) PER HOUR PER FOOT WIDTH OF CARRIAGEWAY. A SIMPLE APPROXIMATION TO THE FORMULA IS PROVIDED WHICH GIVES THE FLOW IN TERMS OF THE JOURNEY SPEED AND IS APPLICABLE TO TOWN CENTERS SIMILAR TO CENTRAL LONDON. /AUTHOR/
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/00410683
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Supplemental Notes:
- Vol 9, pp 528-532
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Corporate Authors:
N/A
, United States -
Authors:
- Wardrop, J G
- Publication Date: 0
Media Info
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Serial:
- Traffic Engineering & Control
- Volume: 8
- Issue Number: 8
- Publisher: Hemming Group, Limited
- ISSN: 0041-0683
- Serial URL: http://www.tecmagazine.com/
Subject/Index Terms
- TRT Terms: Average spot speed; Central business districts; Equations; Green interval (Traffic signal cycle); Intersections; Mathematical analysis; Pavements; Traffic delays; Traffic density; Traffic flow; Traffic speed; Traffic surveys; Urban areas; Width
- Old TRIS Terms: Overall travel speed; Pavement width
- Subject Areas: Highways; Operations and Traffic Management; Pavements;
Filing Info
- Accession Number: 00227173
- Record Type: Publication
- Source Agency: Traffic Systems Reviews & Abstracts
- Files: TRIS
- Created Date: Aug 13 2004 6:56PM