What is the taper length formula for a posted speed of 45 mph or faster?

The taper length formula for a posted speed of 45 mph or faster is determined by the equation L = WS, where L is the taper length, W is the width of the lane being closed in feet, and S is the speed in mph.

This formula is crucial for ensuring that drivers have sufficient distance to merge safely into an active lane of traffic when there is a lane closure. The reason this formula is designed as such is that it directly relates the speed of traffic to the width of the lane being affected — higher speeds require longer taper lengths to provide drivers adequate reaction time and safe maneuvering space.

In practical applications, using this formula allows road crews and traffic managers to establish effective and safe traffic control measures, especially in high-speed environments. This fosters a safer transition for vehicles into open lanes and minimizes the risk of accidents in construction or maintenance zones.