United States Department of Transportation
i
Investigation of accident reduction by grooved concrete pavement : final report.
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1979-06-01
[PDF-2.80 MB]
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Abstract:This report is a category 2 experimental project evaluation written in conjunction with EHS-I-10-3(93)158 and EHS-I-12-1(44)0 contracted to groove hardened PCC pavement. In it the wear characteristics, pavement texture, skid resistance, and the accident reduction are discussed, plus the experience Louisiana had with the sawing of the grooves in its hard-gravel portland cement concrete.
The results of the study indicated that (1) because of the grooves the texture measurements went up and did not change substantially throughout the study period; (2) the grooves showed signs of wearing out in spots but an average wear was 0.006-0.009 inches per year, so that the projected time to "wear out" is 9 to 18 years on this project; (3) skid resistance rose from a skid number of 32 before grooving to 48 near the termination of the project; and (4) the wet accident rate was reduced some 64% near the end of the study.
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