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The Oregon DOT Slow-Speed Weigh-in-Motion (SWIM) Project : final report
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Filetype[PDF-393.70 KB]

  • Publication/ Report Number:
    OR-RD 99-18
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  • NTL Classification:
    NTL-FREIGHT-Trucking Industry
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  • Abstract:
    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 110% 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 = 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. 64 p.

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