What must drivers have with them while transporting class A or B explosives?

When transporting Class A or B explosives, it is essential for drivers to have a written route plan with them. This route plan is a critical safety measure that helps ensure compliance with regulations related to the safe transport of hazardous materials. The written route plan outlines the specific path the driver should take, which is especially important for explosive materials due to the potential hazards involved.

Drivers often need to avoid populated areas, environmentally sensitive zones, and routes that have limitations relevant to transporting such dangerous materials. Having the written route plan assists in maintaining safety and adhering to legal requirements, thereby minimizing risks during transportation.

While having a carrier's insurance policy may be important for overall operational safety and liability purposes, it is not a specific requirement for transporting Class A or B explosives according to federal regulations. Therefore, the primary necessity for drivers in this situation is indeed the written route plan.