What is the typical flare rate for Barrier Rail at 70 MPH?

The typical flare rate for Barrier Rail at 70 MPH is established based on the need for safe traffic design and to ensure that vehicles can be safely redirected in the event of a collision. A flare rate of 20:1 means that for every 20 units of horizontal distance, the barrier rises 1 unit vertically. This rate is effective in reducing the potential for vehicles to slide along the barrier, thus providing an adequate transition that minimizes the likelihood of serious accidents.

This design consideration is crucial for maintaining safer roadways, especially at higher speeds such as 70 MPH. The flare rate allows for a gradual change in alignment and lessens the angle of impact should a vehicle make contact with the barrier, enhancing overall safety.