The table below shows how the wording used for PC*MILER hazmat routing options, which is derived from industry-standard placarded descriptions of hazardous materials, corresponds to the U.S. Department of Transportation Hazmat classifications.

U.S. DOT Hazmat Classes (corresponding PC*MILER routing options are bolded): 

    Class 1: Explosives – Explosive  

    Class 2: Compressed Gases               

                2.1: Flammable Gas – Flammable               

                2.2: Non-Flammable Compressed Gas – Other                

                2.3: Poisonous Gas – Inhalant  

    Class 3: Flammable and Combustible Liquid – Flammable  

    Class 4: Flammable Solids               

                4.1: Flammable Solid – Flammable               

                4.2: Spontaneously Combustible Material – Flammable                

                4.3: Dangerous When Wet Material – Other  

    Class 5: Oxidizers – Other  

    Class 6: Poisons               

                6.1: (part) Inhalation Hazard – Inhalant               

                6.1: (balance) – Other               

                6.2: Infectious Substance (Etiologic agent) [“Biohazard”] – Other  

    Class 7: Radioactive Materials – Radioactive  

    Class 8: Corrosive Liquids – Corrosive (“Caustic” in PC*MILER 22 and earlier)

    Class 9: Miscellaneous – Other  

Determining Which Route Type to Use

Hazmat regulations for a particular tunnel on a route should be checked if there is any doubt about which materials are permitted. Regulations may change over time and might not be included in the version of the PC*MILER database that you are currently using. The shipper of hazardous materials is legally responsible for determining the U.S. DOT Hazmat Class for their shipment and communicating that class to the carrier in their shipping papers.