If your CMV is at least _______ in width and at least _________ long, you must activate your hazard warning lights when stopped on the shoulder of a roadway.

The correct dimensions for when you must activate your hazard warning lights on a stopped commercial motor vehicle (CMV) align with regulatory guidelines designed to ensure safety. A CMV that is at least 80 inches in width and at least 30 feet long is of a size that may pose a significant obstruction on the roadway. Activating hazard warning lights alerts other drivers of the vehicle’s presence, particularly important when the vehicle is parked on the shoulder, which could otherwise be challenging to see.

Vehicles that meet these specifications are often larger and may be less maneuverable, resulting in a heightened risk for other motorists if they do not recognize the stopped vehicle in a timely manner. The requirement to use hazard lights thus serves as a safety measure, reducing accidents and improving overall traffic flow by signaling potential danger.

The other choices do not meet the legal standards for size recognition in this context, either falling short in width or length and potentially creating a false sense of safety for vehicles that do not meet the threshold requirements. It is crucial for drivers to be aware of these regulations to comply with state laws and promote road safety.