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Primary and subsidiary placards
There are two types of placards:
Generally, only primary placards are displayed. Section 172.505 of the Hazardous Materials Regulations (HMR) requires additional placards to be displayed under certain conditions for several subsidiary hazards. This includes “POISON GAS,” “POISON INHALATION HAZARD,” “POISON,” “CORROSIVE,” and “DANGEROUS WHEN WET.” Other subsidiary placards are permitted to be displayed but are not required.
Placard specifications
To be in compliance, all placards must meet the following specifications:
Tagboard placards must:
White square background
Transportation by highway (172.507)
A square background behind the placard is required when a motor vehicle is used to transport a highway route-controlled quantity of radioactive material.
Primary and subsidiary placards
There are two types of placards:
Generally, only primary placards are displayed. Section 172.505 of the Hazardous Materials Regulations (HMR) requires additional placards to be displayed under certain conditions for several subsidiary hazards. This includes “POISON GAS,” “POISON INHALATION HAZARD,” “POISON,” “CORROSIVE,” and “DANGEROUS WHEN WET.” Other subsidiary placards are permitted to be displayed but are not required.
Placard specifications
To be in compliance, all placards must meet the following specifications:
Tagboard placards must:
White square background
Transportation by highway (172.507)
A square background behind the placard is required when a motor vehicle is used to transport a highway route-controlled quantity of radioactive material.