This is a summary of the traffic phase at the above mentioned project based on data collected from Clay, Washington and Wright Counties.
This project was initiated by the Minnesota Local Road Research Board in August 1975 and coordinated by the Physical Research Section of Mn/DOT. The project was started because of insufficient data available to set realistic spring load restrictions or design bituminous and other road structure improvements.
The report covers the field data collected and the methods used in processing the data. The appendix contains specific data from individual locations in each county.
Mn/DOT has been using automatic continuously operating WIM since 1981. At that time, very few states were using WIM and no state had a continuously operating system. There were no edit procedures which could be used to determine the validity of the data. Vendors, FHW A and the few states using WIM had not yet developed any procedures beyond using a test truck to calibrate the system. Consequently, it was necessary for Mn/DOT to develop procedures which they could use on their WIM data.
In order to do that, the data collected by the WIM was analyzed over an extended period of time. A significant effort was made to identify patterns in and characteristics of the data which could be used in a data verification program. This report contains those procedures which were developed over the years and also in the past year when working a mobility assignment at MnROAD.
