30 CFR § 36.33
Headlights and fixtures
July 29, 2020
(a) Headlights and lighting fixtures on mobile diesel-powered transportation equipment shall be protected from external damage by recessing them in the equipment frame, enclosing them within a shield of substantial construction, or by any other method that provides equivalent protection.
(b) Mobile diesel-powered transportation equipment shall be equipped with at least one headlight on each end.
[47 FR 11372, Mar. 16, 1982]