Runaway truck ramp
It is typically a long, sand- or gravel-filled lane connected to a steep downhill grade section of a main road, and is designed to accommodate large trucks or buses.It allows a moving vehicle's kinetic energy to be dissipated gradually in a controlled and relatively harmless way, helping the operator stop it safely.Emergency escape ramps are usually located in mountainous areas which cause high construction costs and present difficult site selection.[1] Long descending grades can allow high vehicle speeds to be reached, and truck brakes can overheat and fail through extensive use.The ramps are often built before a critical change in the radius of curvature of the road, or before a place that may require the vehicle to stop, such as before an intersection in a populated area.
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