If you are transporting explosives and your vehicle breaks down, you may notify other drivers:

Question

If your vehicle breaks down on the road while you are transporting explosive materials, you must warn other drivers. Put out warning signals like reflective triangles or electric lights if you are carrying Division 1.1, 1.2, or 1.3 explosives. Do the same if you are driving a tank used to transport Class 3 flammable liquids or Division 2.1 flammable gases, even if the tank is empty. If transporting flammable materials, do not use warning signals that could cause your cargo to catch fire.

Accepted Answer

With electric lights.

Answer

With flares.

Answer

By standing on the roadway and waving your arms.

Answer

By keeping the driver's side door open.