United States Department of Transportation
i
Siskiyou summit negative grade arrester bed for runaway trucks : final report.
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1986-01-01
[PDF-1.42 MB]
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Abstract:Most escape ramps are designed to use gravity as the primary deceleration mechanism. These ramps provide an exit from the roadway to an adjacent hillside, ascending at grades of up to 40%. Loose gravel is often used on these ramps which, while aiding in the deceleration, is primarily provided to prevent the trucks from rolling back down the ramp. Unfortunately, ascending ramps are not possible in all locations where they are needed. This report presents the results from a special type of escape ramp, a ramp that is located on a descending grade.
When an ascending ramp proved infeasible, it was decided to design and build a descending escape program was established to determine if a descending grade gravel arrestor bed, including transverse gravel mounds, could safely stop a runaway truck. The testing was divided into three segments: choosing aggregate size and gradation, testing the effect of gravel transverse mounds, and on-site testing of the escape ramp prior to its opening for use by the public.
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