OHVs now allowed on national forest roads. CADILLAC — Off-highway vehicles (OHVs) are now allowed on the majority Huron-Manistee National Forests roads, effective Oct. 1. Some municipalities and the state of Michigan refer to such vehicles as off road vehicles (ORVs). These include all-terrain vehicles (ATVs), which is 50 inches or less in width; utility terrain vehicles (UTVs), an off-highway…