The Minnesota Department of Natural Resources has announced a plan for two state forests designed to limit the use of All Terrain Vehicles to special ATV trails. The agency says its part of a wider attempt to impose more stringent restrictions on ATV use in all state forests. Minnesota Public Radio's Mary Losure reports. In recent years, the number of ATV's in the state has skyrocketed. Last year, more than 148 thousand ATV's were registered for recreational use in Minnesota.