I would recommend calling PennDOT and asking them to get a correct answer. Their phone number (as well DOT for every state( is listed in your commercial motor vehicle atlas.
A commercial motor vehicle is any vehicle used in commerce to transport passengers or property with either:
A department of the federal executive branch responsible for the national highways and for railroad and airline safety. It also manages Amtrak, the national railroad system, and the Coast Guard.
State and Federal DOT Officers are responsible for commercial vehicle enforcement. "The truck police" you could call them.
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My question is do you need a CDL with hazmat to transport fire extinguishers in PA? The gentleman that comes to inspect our schools' extinguishers asked me & honestly I don't know for sure. He drives a van & transports full & empty cylinders to and from his shop to repair them or refill them. Is there a certain amount he can transport without a CDL? I could not find a definite answer online. Thanks
CDL:
Commercial Driver's License (CDL)
A CDL is required to drive any of the following vehicles:
HAZMAT:
Hazardous Materials
Explosive, flammable, poisonous or otherwise potentially dangerous cargo. Large amounts of especially hazardous cargo are required to be placarded under HAZMAT regulations