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R R UU M M B B L L EE S S TT R R II P P SSBy 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
Head On and Sideswipe - Fatal and A Injury CrashesStatewide All Two Lane Roads
0
50
100
150
200
250
300
350
1993 1994 1995 1996 1997 1998 1999 2000 2001 2002
Year
Number
A Injury
Fatal
Head On and Sideswipe - Fatal and A Injury CrashesTrunk Highway Two Lane Roads
0
20
40
60
80
100
120
140
1993 1994 1995 1996 1997 1998 1999 2000 2001 2002
Year
Number
A Injury
Fatal
PennDOT conducted rumble strip research on two lane rural road highways.
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.
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
Michigan Study
R O A D R E S E A R C H
• Multi-state review (7 states)
• 98 sites with 211 miles
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
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
Insurance Institute for Highway Safety
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
Design of Centerline Rumble Strips
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
Oregon Solution
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
Oregon: Conclusions after 2 years
R O A D R E S E A R C H
Design of Centerline Rumble Strips
• 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
R O A D R E S E A R C H
Design of Centerline Rumble Strips
• 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
R O A D R E S E A R C H
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
Minnesota Research• 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
R O A D R E S E A R C H
Rumble StripsRumble Strips in District 3in District 3
I N S T A L L A T I O N
I N S T A L L A T I O N
I N S T A L L A T I O N
I N S T A L L A T I O N
I N S T A L L A T I O N
I N S T A L L A T I O N
Sweeps up debrisI N S T A L L A T I O N
Challenge to Materials Engineers
• 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
T H E F U T U R E
Challenge to Materials Engineers
• 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
T H E F U T U R E
Challenge to Materials Engineers• 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
T H E F U T U R E
Questions or Comments
Q&A
Building More. Building Faster. Moving Better.