• Off-Road Vehicle Advisory Workgroup (ORVAW) The purpose of the Off-Road Vehicle Advisory Workgroup (ORVAW) is to assist the Michigan Snowmobile and Trails Advisory Council (MSTAC) in performing the duties and responsibilities of the MSTAC and to provide the Department of Natural Resources and Environment (DNRE) advice related to the off-road vehicle program. This includes advice related to the creation, development, operation, and maintenance of the designated ORV trail system.