Except as otherwise regulated by federal law, every vehicle carrying or transporting nitroglycerine in this state shall have conspicuously marked thereon in letters not less than six (6) inches in height on each side and the rear of such vehicle, the words "Nitroglycerine - Dangerous."
Okla. Stat. tit. 63, § 128.1
Transporting vehicles to be labeled
R.L. 1910, § 6972
Official source: Oklahoma Legislature. Reproduced from public-domain Oklahoma statutes; confirm against the official source for the current text. Not legal advice.