A runaway truck ramp on the A7 in Germany

A runaway truck ramp, runaway truck lane, escape lane, safety ramp, emergency escape ramp, or truck arrester bed is a traffic device that enables vehicles which are having braking problems to stop safely. 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] Designs include:


Emergency escape ramps are usually located on steep, sustained grades, as in mountainous areas.[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.[2] The placement criteria can vary from one region/country to another.


See also


  1. ^ a b c DOT Arizona (May–June 1993). "Full-Scale Arrester Bed Testing Leads to More Cost-Effective Design" (PDF). TR News (166): 20–21. Retrieved 2006-07-23.
  2. ^ a b c Design Manual - Auxiliary Lanes (PDF). Washington State Department of Transportation. May 2006. Chapter 1010, pp. 4–5. Archived from the original (PDF) on 2005-09-24.
  3. ^ "Highway 11 Runaway Truck Ramp". Ontario Ministry of Transportation. 2009-06-26. Archived from the original on 2012-05-06. Retrieved 2016-11-18.
  4. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2011-09-05. Retrieved 2011-12-17.((cite web)): CS1 maint: archived copy as title (link)