Weigh-in-Motion Pocket Guide: Part 3 - WIM Calibration and Maintenance Guide
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Weigh-in-Motion Pocket Guide: Part 3 - WIM Calibration and Maintenance Guide

Filetype[PDF-3.43 MB]

  • English

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    • Abstract:
      The Federal Highway Administration (FHWA) Weigh-In-Motion (WIM) Pocket Guide consists of three main text documents, four instructional video supplements, and six appendices. The video supplements and appendices are only available on the FHWA website: https://www.fhwa.dot.gov/policyinformation/knowledgecenter. Part 1 includes a description of each element of the FHWA WIM Pocket Guide (referred as Guide through the rest of the document). This Part 3 was developed to assist WIM technicians in the proper maintenance and calibration of WIM sites. It includes step-by-step instructions for calibrating a WIM system; suggestions for tools, forms, and reporting processes that can be used for calibration and system maintenance; and a recommended process for troubleshooting system faults. The WIM Calibration section of the Guide includes valuable information for conducting a successful WIM calibration that is based on best practices, including a pre-visit traffic and profile data analysis to develop WIM system accuracy expectations for the validation, on-site activities to ensure the proper operation and calibration of the WIM system, and a post-visit analysis to assess the effectiveness of the calibration. Properly conducting these activities will ensure high-quality WIM data collection. The WIM System Maintenance section of the Guide includes a scope of recommended maintenance activities, recommended schedules, description of field checks, and recommendations for field logs, acceptance testing, and maintenance reports. This section also includes a comprehensive WIM troubleshooting procedure. Throughout this document, action items are identified using numerical sequencing or the checkmark icon. Please also refer to manufacturers’ documentation for additional guidance on recommended maintenance schedules and specific calibration requirements.
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