For speeds of 40 MPH or less, what is the correct formula for taper length?

For speeds of 40 MPH or less, the correct formula for calculating taper length is derived from the need to safely transition vehicles from a travel lane into a work zone area. In this context, taper length is influenced by both the speed of the traffic and the width of the taper.

The formula L = WS(Squared)/60 accounts for both the speed of the vehicle (in miles per hour) and the width of the taper (in feet). The inclusion of the squared term in the formula allows for a proportionally longer taper length as the speed increases. Hence, the formula provides a means to compute the taper length that ensures vehicles have enough distance to safely maneuver into or out of a work zone while maintaining their speed, accommodating the dynamics of vehicle handling and road safety.

This particular formula is specifically designed for low-speed scenarios, which is why it applies to speeds of 40 MPH or less. It reflects the safe tapering needed to facilitate smooth transitions for vehicles approaching a work zone, reducing the risk of accidents. The adjustment for the square of the speed in the denominator effectively normalizes the calculations, promoting safety standards in traffic control during construction or maintenance activities.