Carriers are no longer allowed to display slogans on the flip style or any other style placard when the placards aren't being used for hazardous materials loads.

Earlier this fall, rules went into effect prohibiting the display of safety signs or slogans, such as "drive safely," that could be confused with hazmat placards.
Some states have begun issuing citations for this violation. The American Trucking Associations recommends carriers who have not yet removed these slogans from their flip style placards do so as soon as possible to avoid costly fines.