VEHICLE SPEEDS AND PATHS DURING FREE-FLOW MOTORWAY MERGING AND EXITING
Traffic behavior was studied at rural diamond interchanges between primary and secondary roads and the observed behavior compared with the assumptions made in geometric design. For freeway under secondary road, by far the greater part of the acceleration takes place on the entrance rather than on the acceleration lane. In these cases, the majority of drivers used the acceleration lane for final small speed adjustments and for positioning for making the merge. When considering the behavior of vehicles leaving the freeway, many vehicles actually accelerate after diverging and do not commence to decelerate until they have traveled up to 400 feet past the end of the nose; however, many drivers did commence deceleration on the designated lane, but the cars were still averaging 50 mph at the nose and heavy vehicles 45 mph.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/0266450X
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Supplemental Notes:
- Proceedings of the Summer Annual Meeting: Road Design, PTRC/P/109.
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Corporate Authors:
Planning and Transport Res and Computation Co Ltd
167 Oxford Street
London W1R 1AH, England -
Authors:
- Ackroyd, L W
- Madden, A J
- Publication Date: 1974
Media Info
- Pagination: p. 264-289
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Serial:
- Publication of: Planning and Transport Res and Computation Co Ltd
- Publisher: Planning and Transport Res and Computation Co Ltd
- ISSN: 0266450-X
Subject/Index Terms
- TRT Terms: Acceleration lanes; Diamond interchanges; Geometric design; Interchange ramps; Merging traffic; Motor vehicles; Primary highways; Secondary roads; Speed; Traffic speed; Vehicle dynamics
- Uncontrolled Terms: Vehicle path
- Old TRIS Terms: Freeway entrances and exits
- Subject Areas: Highways; Safety and Human Factors;
Filing Info
- Accession Number: 00084705
- Record Type: Publication
- Report/Paper Numbers: PTRC/P/109
- Files: TRIS
- Created Date: Jul 2 1975 12:00AM