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R U M B L E S T R I P S. By Gary Dirlam, Mn/DOT District 3 Traffic Engineer. Last year 657 people died on Minnesota Highways. Mn/DOT Lost one of it’s own to a Head-On Crash. R O A D R E S E A R C H. PennDOT conducted rumble strip research on two lane rural road highways.

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R U M B L E S T R IP S

By Gary Dirlam, Mn/DOT District 3 Traffic Engineer


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Last year 657 people died on Minnesota Highways


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Mn/DOT Lost one of it’s own to a Head-On Crash


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R O A D R E S E A R C H

PennDOT conducted rumble strip research on two lane rural road highways.


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R O A D R E S E A R C H

PennDOT has adopted Centerline Rumble Strips as part of its 3R program estimating a 20% reduction in fatal crashes.


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Michigan Study

R O A D R E S E A R C H

  • 82 % drift off road drivers were drowsy/asleep

  • 53% drift off road right/ 47% drift off road left

  • Micro-sleeps of 4-5 seconds, vehicle can travel 300 feet

  • Micro-sleep—eyes stay open, brain not processing information


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Insurance Institute for Highway Safety

R O A D R E S E A R C H

  • Multi-state review (7 states)

  • 98 sites with 211 miles


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Insurance Institute for Highway Safety

R O A D R E S E A R C H

  • AADT range from 5,000 to 22,000

  • Average ADT of 8,800 to 9,700 after

  • Overall 14% reduction in all crashes


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Insurance Institute for Highway Safety

R O A D R E S E A R C H

  • 25% reduction in injury head-on and side-wipe crashes

  • Only Minn. showed increase in opposing direction injury crashes

  • Minn. increase was not statistically significant


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Design of Centerline Rumble Strips

R O A D R E S E A R C H

  • Maine is the only other state I know which has used the RS each side of Centerline

  • Washington State and Oregon have included a widen center median to install the Rumble Strip


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Oregon Solution

R O A D R E S E A R C H

  • Experimental application of centerline rumble strips

    • Milled-in a center median

    • In no passing zones

  • Tactile vibration if driver encroaches centerline

  • Installed 2 years ago


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Oregon: Conclusions after 2 years

R O A D R E S E A R C H

  • Next steps:

    • wait for one more year of data

    • develop regression models

    • apply comparison group and empirical-bayes approach

  • Data would indicate the rumble strips have been effective at reducing target crashes


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Design of Centerline Rumble Strips

R O A D R E S E A R C H

  • California, Pennsylvania,and Colorado have used the Rumble Strips across the Centerline

  • Minnesota Metro has used Rumble Strips across Centerline as has Districts 6, 3 and 8 on Highway 23


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Design of Centerline Rumble Strips

R O A D R E S E A R C H

  • District 3 has used the separated Rumble Strips for the 8 miles installed on Highway 55 and 4 miles on Highway 169 in 2000

  • District 3 has used the separated Rumble Strips for the 190 miles installed October 2003


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Where Installed?

R O A D R E S E A R C H

  • Each section of the 190 miles of new rumble strip had one fatal crash in last 10 years

  • Evaluate performance over this winter

  • Plan for second CLRS project


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Minnesota Research

R O A D R E S E A R C H

  • Research driver interaction with centerline rumble strips and design of centerline RL

  • Research mid-lane rumble strip

  • Mid-lane could replace centerline and shoulder rumble strip


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I N S T A L L A T I O N

Rumble Stripsin District 3


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I N S T A L L A T I O N


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I N S T A L L A T I O N


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I N S T A L L A T I O N


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I N S T A L L A T I O N


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I N S T A L L A T I O N


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Sweeps up debris

I N S T A L L A T I O N


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Challenge to Materials Engineers

T H E F U T U R E

  • Safety problem is too great to ignore and/or accept 5 fatal crashes each year in District 3

  • Materials Engineers’ challenge is to develop treatment for RS to preserve pavement life and life of pavement markings


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Challenge to Materials Engineers

T H E F U T U R E

  • District 3 recently installed shoulder RS on Highway 12 which were fog sealed

  • Fog seal also fogged the epoxy edge line

  • District 4 masked over center line tape with protective covering and removed covering after paver passed over


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Challenge to Materials Engineers

T H E F U T U R E

  • Next day, fog seal of macro surface covered up tape pavement markings—$2.12 /ft material investment covered (tape was 5 years old)

  • So far I have not heard of any contractor paying for ruining pavement markings


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Questions or Comments

Q&A


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Building More. Building Faster. Moving Better.


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