Weigh-in-motion (WIM) systems have been increasingly used to screen potentially overweight vehicles. However, under slow speed conditions (less than 10 mph), WIM scales appear to be capable of estimating static gross vehicle weight to within -10% with 95% confidence. This report presents findings from a year-long field test of a slow-speed weigh-in-motion (SWIM) system. A regression model was used to improve accuracy and precision by accounting for the effects of time, weather, and vehicle speed. Following correction, accuracy improved to 12 of 1% at both the axle and vehicle levels. Also following correction, 95% of the observations were within 6.8% of the static scale weight at the axle level. At the vehicle level, precision improved to within 4.4%. The precision of the corrected data for vehicles and tandem axles approaches the levels stated by the ASTM in its standard specification for Type IV (enforcement applications) WIM systems.
Oregon DOT (Department of Transportation) Slow-Speed Weigh-in-Motion (SWIM) Project
1998
64 pages
Report
Keine Angabe
Englisch
Road Transportation , Transportation , Transportation & Traffic Planning , Moving vehicle weight measurement , Oregon , Traffic surveillance , Axle load measurements , Vehicle weight , Dynamic scale , Weight measurements , Measuring instruments , Weight indicators , Accuracy , Enforcement , Regression analysis , Slow-speed weight-in-motion
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