Final answer:
Stopped vehicles containing explosives are marked with hazard signs, and emergency personnel use warning signals such as flashing lights and road flares to ensure safety. In controlled environments, advanced screening tools like gamma-ray or x-ray devices may be used.
Step-by-step explanation:
When dealing with stopped vehicles that contain explosives, warning signals are crucial to ensure the safety of nearby individuals and responders. In most cases, these vehicles would be marked with hazard signs indicating the presence of explosive materials. Emergency personnel may use flashing lights, cones, and warning tape to cordon off the area around the vehicle.
Law enforcement and bomb disposal units are often equipped with specialized signaling and communication tools to inform and instruct the public at a safe distance. For example, in a traffic scenario, law enforcement might use road flares or electronic sign boards to warn approaching drivers of the hazard ahead. It is imperative for the safety of all nearby that these warnings are heeded and for traffic to keep a safe distance until the situation has been resolved. Moreover, in controlled environments such as checkpoints or toll stations, more advanced screening tools might be utilized, such as gamma-ray, x-ray-, or neutron-scanning devices to check vehicles discreetly from a safe distance.