The following words and phrases when used in this act N.M. Stat. Ann. § 63-3-35 to 63-3-38 shall, for the purpose of this act, have the meanings respectively ascribed to them in this section, except in those instances where the context clearly indicates a different meaning.

A. “Public highways”: every place or way of whatever nature open to the use of the public as a matter of right for purposes of vehicular travel.

B. “Grade crossing” or “crossing at grade”: a crossing so constructed that a highway crosses railroad tracks upon the same grade as is occupied by such tracks.

C. “Grade separation”: a separation of the grade of railroad tracks from that of a highway at a railroad crossing, so constructed that the highway will either pass under the tracks of the railroad or over such tracks, at a sufficient height above the same to permit railroad trains to pass under such highway.

D. “Grade separation limits”: all that portion of a highway at or near a railroad crossing between the points where the grade line of such highway leaves its natural grade on one side of a railroad track and where it returns to its natural grade on the other side of such track.