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Impact of Non-Freeway Rumble Strips
Gregory C. Johnson, PE
Chief Operations Officer
Michigan Department of Transportation
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Introduction
• Michigan Department of Transportation– Project Manager: Jill Morena, PE
• Wayne State University:– Timothy J. Gates, PhD, PE– Peter T. Savolainen, PhD, PE– Tapan K. Datta, PhD, PE– Ryan G. Todd– Brendan J. Russo [email protected]
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Problem Statement
• Reduce Lane-Departure Crashes• Rumble Strip Installation
– 5,400 Miles of Non-Freeway – Centerlines– Shoulders
• Evaluate Rumble Strip Installations and Provide Future Implementation Guidance
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Research Performed
• Video of Driver Behavior– Encroachment
• Centerline • Shoulder
– Passing Maneuvers• Bicyclists• Vehicles
• Surveyed Bicyclists about Rumble Strips
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2008installation
Before Crashes
AfterCrashes
1,494 miles 584 392
Research Performed
• Crash Data Analysis• Video Logs of Pavement Centerlines
– Evaluate Pavement Cracking – Before and after Rumble Strip Installations
• Roadside Noise
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Results
• Safety– Improved Driver Performance
• Pavement Performance– Do not Contribute to Short-Term Transverse
Cracking in Asphalt Pavements• Noise
– Deeper Rumbles Produce Higher Noise Levels – Noise Typically did not Exceed the Roadside Noise
Level Produced by Tractor-Trailer
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Recommendations
• Depth of 0.5 Inch at the Center and 0.375 Inch at the Outer Edges Reduces Noise
• Installation on 6 Foot or Wider Shoulders Increases Bicyclist Perceived Safety
Report Available @
www.michigan.gov/mdotresearch
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Implementation Status and Strategy
– Installing Rumble Strips• Follow Specification
– Communicate Results• Research Spotlight• Three TRB Papers
– Phase II Project • Quantify the Benefit• Develop Guidelines
– Cities– Counties
“We expect Phase 2 of this project to give transportation agencies in Michigan and other states the data they need to implement their own initiatives.”
Jill Morena, PEProject Manager
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Value• Save Lives and Reduce Crashes Annually
– 300 Crashes – 60 Incapacitating Injuries – 15 Lives
• Improving the Quality of Life• Investment
• Research $262,829 • Construction 3 years @ $2.7M /year• Total $8.3 Million
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Questions?
Customer Service is ImportantPlease take our customer survey:
www.michigan.gov/mdot
Better.Faster.Cheaper.Safer.Smarter