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Title: VEHICLE SPEED AND FLOW IN VARIOUS WINTER ROAD CONDITIONS
Accession Number: 00810832
Record Type: Component
Availability: Find a library where document is available Abstract: Continuous measurements of traffic and weather variables were undertaken at five road sites in central Sweden during the winter of 1998-1999. Visual observations of the state of the roads were made at the same time. Traffic measurements, with the vehicles grouped into three categories, included vehicle speed and flow. Data were aggregated as average values per hour. Weather data were gathered from Road Weather Information Systems stations of the Swedish National Road Administration close to the observation sites. The data included precipitation (rain or snow), intensity (mm/h), risk of slipperiness due to hoarfrost and other similar conditions, air temperature, road surface temperature, wind force, and wind direction. Observations were made on weekdays from 6 a.m. to 8 p.m. Observational frequency of road states varied from twice per day to once per hour depending on the situation. The road states were classified into one of 18 categories depending on road surface characteristics. A new data analysis method was developed whereby traffic data for hours of normally similar traffic conditions were compared. Any observed differences could therefore be assumed to be associated with different weather or road conditions. The method takes into account daily, weekly, and seasonal variations in speed and flow. The analysis resulted in data for the average speed and flow for any particular road state compared with averages for bare road conditions. For speed, significant, systematic, and plausible differences were established. Road surface conditions, however, were shown to have no systematic influence on traffic flow, suggesting that weather is probably a more important factor.
Supplemental Notes: 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.
Monograph Title: Monograph Accession #: 00810814
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: WALLMAN, C-GPagination: p. 159-166
Publication Date: 2001
Conference:
Ninth Maintenance Management Conference
Location:
Juneau, Alaska ISBN: 0309067472
Media Type: Digital/other
Features: Figures
(4)
; Tables
(5)
TRT Terms: Uncontrolled Terms: Geographic Terms: Subject Areas: Highways; Maintenance and Preservation; Operations and Traffic Management; Planning and Forecasting; I62: Winter Maintenance; I72: Traffic and Transport Planning
Files: TRIS, TRB
Created Date: Apr 27 2001 12:00AM
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