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Toolbox of Countermeasures and Their Potential Effectiveness for Roadway Departure CrashesTable 3 (continued)Geometric CountermeasuresCountermeasure(s)Widen shoulder (from 6 to 7 ft)Widen shoulder (from 6 to 8 ft)Widen shoulder (from 6 to 9 ft)Widen shoulder (from 6 to >9 ft)Widen shoulder (initially less than 1 ft)Widen shoulder (initially between1 ft and 3.3 ft)Widen shoulder (paved)(from 0 to 2 ft)Widen shoulder (paved)(from 0 to 4 ft)Widen shoulder (paved)(from 0 to 6 ft)Widen shoulder (paved)(from 0 to 8 ft)Widen shoulder (unpaved)(from 0 to 2 ft)Widen shoulder (unpaved)(from 0 to 4 ft)Widen shoulder (unpaved)(from 0 to 6 ft)Widen shoulder (unpaved)(from 0 to 8 ft)CrashSeverityAreaTypeRoad TypeAllCrashesAll Rural 2-lane -1(4) 14All Rural 2-lane 4(2) 14All Rural 2-lane 21(6) 14All Rural 2-lane 18(3) 14Run-off-Road CrashesHead-onCrashesRear-endCrashesFixedObjectCrashesFatal/Injury Rural 2-lane 25 18 400 - 2,000Fatal/Injury Rural 2-lane 13 18 400 - 2,000All 16 9 16 9All 29 9 29 9All 40 9 40 9All 49 9 49 9All 13 9 13 9All 25 9 25 9All 34 9 34 9All 43 9 43 9OtherCrashesDaily Traffic Volume(vehicles/day)Table 4: Median CountermeasuresCountermeasure(s)Install medianInstall median (flush)Install median barrierCrashSeverityAreaTypeRoad TypeAllCrashesAll All All 15 1Injury Rural Multilane 12(3) 4Fatal/Injury Rural 2-lane -94(56) 4Injury Urban Multilane 22(2) 4Fatal/Injury Urban 2-lane 39(10) 4PDO Rural Multilane 18(3) 4PDO Rural 2-lane -128(55) 4PDO Urban Multilane -9(2) 4All 44 9 d 72 9 5,000/laneFatal 90 9All c 58 9 5,000/laneAll 19 9 35 9All All All 86(3) 17All Multilane divided -24(3) 4Fatal Multilane divided 43(10) 4Injury 40 9Fatal/Injury All All 88(5) 17Injury Multilane divided 30(6) 4Run-off-Road CrashesHead-onCrashesRear-endCrashesFixedObjectCrashesOtherCrashesDaily Traffic Volume(vehicles/day)Table 4 (continued on page 9)toolbox of countermeasures September 2007
Toolbox of Countermeasures and Their Potential Effectiveness for Roadway Departure CrashesTable 4 (continued)Median CountermeasuresCountermeasure(s)Install median barrier (cable)Install median barrier (concrete)Install median barrier (steel)Install or upgrade median barriernear gore areaInstall raised medianCrashSeverityAreaTypeRoad TypeAllCrashesAll Highway (3-lane) -34(74) 4Fatal Rural Highway 92 6Injury Highway (3-lane) 26(84) 4Injury Multilane divided 29(11) 4Injury Multilane divided -15(36) 4Fatal 90 9Injury 10 9Injury Multilane divided 35(8) 4Run-off-Road CrashesHead-onCrashesRear-endCrashesFixedObjectCrashesOtherCrashesAll 17 9 56 9 39 9
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