A slow-moving vehicle sign must be on the back of a vehicle if it is going less than what speed?

A slow-moving vehicle sign is required on the back of a vehicle when it is traveling at speeds of 25 mph or less. This requirement is in place to alert other drivers that the vehicle is moving slower than the typical traffic speed, ensuring that they can take appropriate measures, such as changing lanes or adjusting their speed, to avoid a collision. The sign helps enhance road safety, especially on roads where higher speed vehicles are common.

Understanding the significance of this regulation emphasizes the importance of being cautious around slower vehicles, which can be due to various reasons such as farm equipment, construction vehicles, or other slow-moving traffic. In contrast, signs are not mandated for speeds above this threshold, reflecting the expectation that most vehicles will be able to operate safely within the average speed limits of the roadway.