Clear Zone

This module calculates the required clear zone width. Clear zone is the lateral distance from the edge of the traveled way that should be cleared of any fixed objects.

Run-out Length

This module calculates the run-out length for a vehicle leaving the roadway. The run-out length is the distance, parallel to the roadway, that a vehicle travels after leaving the roadway before it can come to a stop.

Lateral Placement

This module calculates the distance to and from roadside barrier based on the roadway speed and type of barrier installed.

Barrier Warrants - Embankments

This module determines whether a roadside barrier (such as guardrail or concrete barrier) is warranted based on the height and steepness of the embankment and the roadway traffic volume.