Rural, Non-Freeway Rural, Non-Freeway RumblesRumbles

Keeping Drivers on the Keeping Drivers on the Road…Road…

Why Why RuralRural , Non-Freeway , Non-Freeway ? ?

80% of all fatal 80% of all fatal single vehicle single vehicle run-off-road run-off-road (ROR) crashes (ROR) crashes occur on two occur on two lane lane ruralrural roadsroads

75% of all 75% of all head-on head-on crashes occur crashes occur on on ruralrural roads roads

Which of these rural Which of these rural crashes are correctable crashes are correctable by rumble strips…?by rumble strips…?

Correctable?Correctable?

swerve to avoid anything…NO

hydroplane…NO

tire blowout…NO

trailer sway…NO

snow or ice…NO

Correctable = Correctable = Drift-OffDrift-Off

Michigan DOTMichigan DOTDrift-OffDrift-Off Crash Maps- Crash Maps-

Dave Morena, FHWA Safety and Dave Morena, FHWA Safety and Traffic Engineer:Traffic Engineer:

Computer generatedComputer generated

Tested to 80% reliability Tested to 80% reliability

Region MapsRegion Maps Centerline Drift-over Centerline Drift-over

Crashes Crashes

5-YR Trunkline Rural, 55 mph:

• 2322 crashes• 255 serious crashes• 129 deaths

Region MapsRegion Maps Centerline Drift-over Centerline Drift-over

Crashes Crashes

Region MapsRegion Maps Centerline Drift-over Centerline Drift-over

Crashes Crashes

Region Maps:Region Maps:Shoulder Drift-off Crashes Shoulder Drift-off Crashes

5-YR Trunkline Rural, 55 mph:

• 3410 crashes• 290 serious crashes• 45 deaths

Common ConcernsCommon Concerns

Pavement / Joint Pavement / Joint

DeteriorationDeterioration MicrosurfaceMicrosurface NoiseNoise BicyclistsBicyclists MotorcyclistsMotorcyclists

Mitigation Strategies Mitigation Strategies 3/8” depth 3/8” depth

1’-2’ centerline pattern1’-2’ centerline pattern

6” to 12” offset 6” to 12” offset

6’ wide min. paved shoulder6’ wide min. paved shoulder

48’-12’ shoulder pattern48’-12’ shoulder pattern

field reviewfield review

AlaskaAlaska ArizonaArizona ColoradoColorado DelawareDelaware GeorgiaGeorgia IowaIowa HawaiiHawaii KansasKansas

KentuckyKentucky MississippiMississippi MissouriMissouri MinnesotaMinnesota PennsylvaniaPennsylvania TennesseeTennessee WashingtonWashington

Aggressive Use of Rumbles

‘‘Crash type is not random…Crash type is not random…

……crash location is.’crash location is.’

Brian Chandler, Missouri Department Brian Chandler, Missouri Department of Transportationof Transportation

Spot Spot treatmenttreatment

or or System-wide?System-wide?SY

STEM-WIDE

Questions?Questions?

Thank you…..Thank you…..