How far should warning devices be placed from a disabled commercial vehicle?

When a commercial vehicle is disabled and cannot be moved, it is essential to place warning devices to alert other drivers of the danger. The correct distance for placing these devices is 30 meters ahead and behind the vehicle. This distance provides ample warning for approaching motorists, giving them sufficient time to respond and safely navigate around the disabled vehicle.

Placing the warning devices too close to the vehicle may not provide enough notice for drivers, who could be traveling at high speeds, especially on highways or open roads. Conversely, a distance greater than 30 meters might unnecessarily increase hazards, as it could lead to confusion regarding the nature and location of the obstruction.

In summary, 30 meters ahead and behind a disabled commercial vehicle strikes a balance between effective communication to other drivers about the hazard and ensuring that the warning devices are noticed in a timely manner.