With a speed limit of 55 mph, what is the minimum PB flare rate required for a lane closure?

In the context of lane closures, the minimum PB (Positive Barrier) flare rate is essential for ensuring that traffic can safely navigate around an obstacle without significantly increasing the risk of collisions. The flare rate describes how quickly the lane narrows and is typically determined based on the posted speed limit of the road.

For a speed limit of 55 mph, the recommended minimum PB flare rate is 16:1. This means that for every one foot of lateral displacement from the edge of the lane closure, the barriers should extend 16 feet back toward the starting point of the closure. This gradual transition helps drivers adjust their speed and direction smoothly as they approach the work zone, enhancing safety for both drivers and workers.

Choosing a flare rate of 16:1 at this speed limit is critical because it optimizes the reaction time for drivers, allowing them to recognize the closure and maneuver appropriately without sudden or sharp directional changes that could lead to accidents.