If your work requires, you may temporarily park within 5 feet of the road with the most of hazardous materials. The following items are the exceptions that forbid parking this close to the edge of the road:

A Explosives 1.1 and 1.2.

explanation

Never park with Division 1.1, 1.2, or 1.3 explosives within 5 feet of the traveled part of the road. [California Commercial Driver Handbook]