In addition to the existing railroad crossing violations in § 4163 of this title, the following railroad crossing infractions apply to commercial motor vehicle operators:
(1) Every commercial motor vehicle operator other than those listed in § 4163 of this title shall, upon approaching a railroad-highway grade crossing, do all of the following:
a. Slow down and check that the tracks are clear of an approaching train or other on-track equipment.
b. Stop before reaching the crossing if the tracks are not clear.
(2) The driver of a commercial motor vehicle shall obey a traffic control device and comply with a lawful order or direction of a police officer or other enforcement official who is guiding, directing, controlling, or regulating traffic at a railroad-highway grade crossing.
(3) The driver of a commercial motor vehicle may not cross a railroad-highway grade crossing unless the vehicle has sufficient undercarriage clearance.
(4) The driver of a commercial motor vehicle may not cross a railroad-highway grade crossing unless the vehicle has sufficient space and can be driven completely through the crossing without stopping.