Crash Barrier - Nchrp 350 Certified Guardrail Terminal Platform, 4:1 Slope Compliance For Vehicle Stability

We are dealing in Crash Barrier that are for the purpose of the guardrail terminal platform is to reproduce to the extent practical the physical conditions under which the terminal unit was tested for its NCHRP 350 test level certification.
1. The grading of the platform (from the platforma s edge perpendicular to the roadway) must not be any steeper than a 4:1 slope even if it requires grading down to the toe of the slope. This is to minimize the possibility of inducing lateral (side to side) instability to an errant vehicle.
2. The algebraic difference of the approach grade (from the platforma s edge parallel to the roadway slopes) compared to either the platforma s grade or the slope the approach grade ties into, must not exceed 10%. This is to minimize the possibility of inducing longitudinal (front to back) instability to the errant vehicle.
3. The above criteria are to allow the vehicle to remain stable if it leaves the pavement. It is essential that the approach grading for the platform blend smoothly from its edge to the roadway slope. In no circumstance should the design of the platform be compromised such that the platform itself could induce instability to the errant vehicle.
4. The a minimum acceptable designa for guardrail platforms without actually constructing a platform is to provide smooth grading with 4:1 or flatter slopes perpendicular to the roadway approaching, adjacent to, and behind the terminal for it