Which materials are the exception to the 5-foot parking rule?

Answer: A — Explosives 1.1 and 1.2

When you’re handling hazmat shipments, there’s a general practice to park so there’s a buffer around the vehicle during loading and unloading. A common example of that buffer is a five-foot clearance to help keep people safe and reduce the chance of exposure if there’s a spill or a reaction. The explosives in Class 1.1 and 1.2 don’t follow that same rule. They’re governed by specialized explosive safety requirements that set different spacing and handling procedures, so the usual five-foot parking rule doesn’t apply to them in the same way. The other material classes listed are subject to the standard parking clearance, which is why explosives are the exception.