Pla Cards are required on specific types of packages that are transported, and the transport vehicle itself must be marked with DOT placards to warn of the hazardous materials. Clearly marking vehicles as carrying hazardous materials ensures the proper and safe transportation of the cargo.
Pla Cards, Warning Signs, Pla Card Label, Warning Label, DOT placards

Pla Card

Placards aware pedestrians and road motorists with stick-on signs containing safety instructions to ensure safe driving environment and reduce any chances of collision & Improving the road Worthiness for other Motorist ;Hazard signs is also indicated with numerical codes representing hazardous materials being transported. 

Visual Guidance

Even with global positioning systems and other navigational tools available for motorists nowadays, road and traffic signs are still of high importance. Traffic is everywhere; therefore, signs should be everywhere too.