TESTS TO DETERMINE THE DESIGN OF ROADSIDE SOFT ARRESTER BEDS
FULL-SCALE TESTS HAVE SHOWN THAT SOFT ARRESTER BEDS SHOULD BE SUITABLE FOR STOPPING VEHICLES WHICH LOSE THEIR BRAKES ON LONG DOWN-GRADIENTS. THE DECELERATION OF PRIVATE CARS AND HEAVY VEHICLES WAS MEASURED AFTER END-ON ENTRY AT HIGH SPEEDS INTO A LONG BED OF LIGHTWEIGHT AGGREGATE MATERIAL (LYTAG). WITH END-ON ENTRY ALL THE VEHICLES WERE STOPPED SATISFACTORILY FROM 72 KM/H WITHOUT THE USE OF BRAKES AT A DECELERATION VALUE OF ABOUT 0.5G. IN THE CASE OF THE DUAL-TRACK BED A 300 MM HIGH CURB WAS REQUIRED ALONG THE FAR SIDE TO ENSURE THAT THE VEHICLES WERE CONTAINED WITHIN IT FOR TYPICAL SIDE-ENTRY ANGLES OF 5 - 10 DEGREES TO THE LENGTH OF THE BED. IN THE CASE OF THE SINGLE TRACK BED, A 300 MM HIGH CURB SURMOUNTED BY A HYDRAULIC CRASH BARRIER WAS FOUND TO BE NECESSARY. THIS ARRANGEMENT DECELERATED VEHICLES AT ABOUT 0.3G ON LEVEL GROUND CORRESPONDING TO ABOUT 0.2G ON A DOWN HILL GRADIENT OF 1 IN 10. /AUTHOR/
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Supplemental Notes:
- Rrl Rept Lr 376, 10 PP, FIG
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Corporate Authors:
Road Research Laboratory /UK
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Authors:
- Laker, I B
- Publication Date: 1971
Subject/Index Terms
- TRT Terms: Curbs; Deceleration; Escape lanes; Lightweight aggregates; Road downgrades; Roadside structures; Subgrade (Pavements)
- Uncontrolled Terms: Hydraulic barriers
- Old TRIS Terms: Arresting /process/; Beds; Deceleration rate; Downgrade; Runaway vehicles
- Subject Areas: Highways; Safety and Human Factors; Terminals and Facilities;
Filing Info
- Accession Number: 00221308
- Record Type: Publication
- Files: TRIS, ATRI
- Created Date: Jun 11 1971 12:00AM