What type of flag is mandated by law for vehicles carrying explosives?

Vehicles carrying explosives are mandated by law to display a red rectangular flag. This requirement is in place to provide clear visibility to other road users that the vehicle is transporting hazardous materials. The use of a red rectangular flag serves as a universal signal of danger, alerting drivers and pedestrians to exercise caution and provide the vehicle with the appropriate amount of space while on the road. This is crucial for ensuring the safety of everyone in the vicinity, as explosives present significant hazards.

Each option represents a different type of flag commonly recognized on roadways, but the red rectangular flag is specifically designated for vehicles carrying explosive materials to comply with safety regulations and promote public awareness of the dangerous loads being transported. Other flag types may not convey the same level of urgency or recognition necessary in these situations.