FLAMMABLE VAPORS
KEEP LIGHTS AND FIRE AWAY
NO SMOKING
must be conspicuously posted at each approach to a Class 3 (flammable) or combustible liquid stowed "on deck" and near each cargo hold ventilator leading to a hold or compartment containing this material. This sign must be painted on a white background using red letters. The letters may not be less than 8 cm (3 inches) high.
49 C.F.R. §176.325