253.150.  Definitions. — As used in sections 253.150 to 253.170 the following terms shall have, unless the context clearly indicates otherwise, the following meanings:

  (1)  "Motor vehicle", any self-propelled vehicle not operated exclusively upon tracks, except farm tractors;

  (2)  "Park thoroughfares", any state park road, intended for use by the general public and designated as such by the department of natural resources.