It shall be unlawful to operate any flashing prewarning or warning signal light on any school bus except when the school bus is preparing to stop or is stopped on a highway for the purpose of permitting school children to board or alight from said school bus.
Mont. Code Ann. § 61-8-352
Prohibited operation of special lighting equipment on school buses
Ap. p
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.