Final answer:
Reflective triangles, flares, and traffic cones can be used to mark a stopped vehicle carrying explosives.
Step-by-step explanation:
When marking a stopped vehicle carrying explosives on the roadside, there are certain emergency warning devices that can be used. These include reflective triangles, flares, and traffic cones. Reflective triangles are highly visible and can be placed at a distance behind the vehicle to warn other drivers. Flares can be used to create a visual warning by emitting a bright and intense light. Traffic cones can also be used to create a physical barrier and guide traffic away from the vehicle.
The use of flares is not recommended as they could present a potential ignition hazard. Instead, reflective triangles and traffic cones are safer options for such sensitive situations. Employing these devices can help prevent further accidents or complications.