Vehicles that normally travel at speeds less than what mph should display a slow-moving vehicle sign?

A slow-moving vehicle sign is required for vehicles that are designed to operate at speeds less than 25 miles per hour. This designation helps to alert other drivers on the road that the vehicle is traveling at a slower speed than typical traffic. The sign serves as an important safety measure, reducing the risk of accidents by giving other drivers advance notice of the slower moving vehicle, allowing them to adjust their speed or change lanes if necessary.

Vehicles traveling slower than the standard traffic flow can create hazards, especially on highways or busy roads. By displaying the slow-moving vehicle sign, these vehicles ensure that they are visible to other motorists, promoting safer interactions. This regulation is particularly relevant for agricultural vehicles, construction equipment, and other types of vehicles designed for lower-speed uses.

The other options offered lower speed limits that do not align with the established standard of 25 mph, as vehicles operating at these lower speeds do not require the same level of safety consideration when joining faster traffic flows.