The first requirement in WIM analysis is an assessment of data quality. Chaparral, in conjunction with Mark Hallenbeck of Washington State.s Transportation Center, developed the WIM quality control (QC) tools for the Long-Term Pavement Performance (LTPP) Project. We offer the service of using these and other tools to provide QC analyses of an agency's WIM data. The agency can use the graphical output from these analyses to assess the quality of data from WIM devices.

Chaparral also has powerful analysis tools for summarizing WIM data and making them generally available through a Public Database. Our TRADAS software system provides, in addition to QC, useful summaries, including both axle load distributions and gross vehicle weight distributions on daily, monthly, and annual summary periods. These summaries are the basis for other powerful analyses, including:

• Assessment of equivalent single axle load (ESAL) factors for each vehicle type evaluated by the WIM equipment.

• Evaluation of alternative load equivalency factors for state-specific loading conditions.

• Determination of loading by vehicle type, day of week, and month (or season) of year.

• Evaluation of commodity tonnage by vehicle type, day of week, and month of year.

• Analyses of port of entry data to establish interstate loading patterns for comparison to intrastate WIM distributions.

• Comparisons of measured load across measurement sites, roadway classification, and other independent variables.

• Determination of best grouping schemes for data analysis and factor calculations (geographical, urban versus rural, roadway type, etc.).

Chaparral offers the full range of analytical services, including data polling of WIM devices, QC processing, data summarization and database creation, and the analytical studies resulting from these processes.

In addition to our in-house expertise developed in our ten years of WIM processing experience, Chaparral can bring together a team of experts from our many contacts in the industry. We can transform your WIM operation from a massive data collection exercise to a valuable planning information repository.connection will be given an additional 10 hours of service under this agreement.