(a) Except as provided by Subsection (c), the operator of a school bus, before crossing a track at a railroad grade crossing:
(1) shall stop the vehicle not closer than 15 feet or farther than 50 feet from the track;
(2) while stopped, shall listen and look in both directions along the track for an approaching train or other on-track equipment and signals indicating the approach of a train or other on-track equipment; and
(3) may not proceed until it is safe to do so.
(b) After stopping as required by Subsection (a), the operator may proceed in a gear that permits the vehicle to complete the crossing without a change of gears. The operator may not shift gears while crossing the track.

(c) An operator is not required to stop at:
(1) an abandoned railroad grade crossing that is marked with a sign reading “tracks out of service”; or
(2) an industrial or spur line railroad grade crossing that is marked with a sign reading “exempt.”
(d) A sign under Subsection (c) may be erected only by or with the consent of the appropriate state or local governmental official.