This report describes the work conducted across the State of Minnesota to determine if an update to the distribution of the classification of vehicles on the County State Aid Highway (CSAH) system is needed. The data were collected across the state, representing many regions, and in all seasons (although very few counts were conducted during winter). The results of this investigation include the development of updated vehicle classification tables for pavement design on the CSAH system, a manual for counties to use when conducting individual vehicle classification counts for pavement design, and a new view of the distribution of vehicle types on the CSAH system, which has not been systematically counted for many years. The results of this study indicate that the vehicle classification distributions on the CSAH system (and likely the county road system) should be updated with new default values to reflect current traffic. In addition, improved information and training should be offered to local agencies to help improve estimates of vehicle classification for pavement design.
