Use of Weigh-in-Motion Data for Pavement, Bridge, Weight Enforcement, and Freight Logistics Applications (2020) / Chapter Skim
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Pages 15-26
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15 This synthesis included developing a survey to determine the state of the practice of WIM at transportation agencies. The survey asked about equipment, calibration, quality control, both standard and innovative uses of WIM data, the type of staff who use WIM data, and impediments to the use of WIM data.
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Figure 1.
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State of the Practice 17 Five agencies used to collect WIM data, but do not now. These agencies answered all other questions based on what the agency did when they were collecting WIM data.
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18 Use of Weigh-in-Motion Data for Pavement, Bridge, Weight Enforcement, and Freight Logistics Applications Although some agencies use their WIM systems for purposes "other" than the four offered in the question (i.e., determine axle and gross vehicle weight, vehicle classification, and axle load spectrum) , most of them did not indicate what those usages are.
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State of the Practice 19 Five state DOTs do not perform quality control. This may be because they have not had issues with quality control of the data, possibly due to their calibration and maintenance procedures eliminating most data issues.
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20 Use of Weigh-in-Motion Data for Pavement, Bridge, Weight Enforcement, and Freight Logistics Applications 6 (12%)
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State of the Practice 21 Supporting pavement design is a major usage of WIM data as 76% of the agencies share WIM data with in-agency pavement designers. WIM data are also often shared with in-agency bridge designers, asset management groups, and freight planning groups.
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22 Use of Weigh-in-Motion Data for Pavement, Bridge, Weight Enforcement, and Freight Logistics Applications 3 (6%)
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State of the Practice 23 4 (8%)
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24 Use of Weigh-in-Motion Data for Pavement, Bridge, Weight Enforcement, and Freight Logistics Applications 4 (8%)
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State of the Practice 25 Reasons for Not Using WIM for Some Applications As indicated in Figures 10 through 13, many agencies do not use WIM data for one or more of the applications (e.g., pavement design, bridge design, asset management, load rating, freight planning) cited in those questions.
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26 Use of Weigh-in-Motion Data for Pavement, Bridge, Weight Enforcement, and Freight Logistics Applications calibration, issues with the durability of sensors, technical issues with handling the data, insufficient data quality for some applications, and legal challenges. Other WIM Data Uses When asked if the DOT has found different uses of WIM data other than those described in the survey, 82% of them indicate "No" and 16% said "Yes," as shown in Figure 17.
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