Video: Importance of HAZMAT Placards and Other Markings
USDOT HAZMAT placards and other markings indicate the type of material being transported and provide critical information to emergency responders about associated risks.
Hazardous materials are divided into seven different classes for packaging and helping in identifying the type of response to be used during emergencies.
You can know more about classification of dangerous goods here.
Watch the video below:
it was very much educative