As used in the Habitat Protection Act:
A. "commission" means the state game commission [state wildlife commission];
B. "cross-country" means travel over the countryside other than by road;
C. "vehicle" means any motor-powered mechanical device used for conveyance; and
D. "road" means any maintained or unmaintained right-of-way that has been utilized by the public and includes roads, streets, highways and state scenic, recreation or historical trails.