R%20U%20M%20B%20L%20E%20S%20T%20R%20I%20P%20S

1
R U M B L E S T R I P S
By Gary Dirlam, Mn/DOT District 3 Traffic Engineer
2
Last year 657 people died on Minnesota Highways
3
Mn/DOT Lost one of its own to a Head-On Crash
4
(No Transcript)
5
(No Transcript)
6
R O A D R E S E A R C H
PennDOT conducted rumble strip research on two
lane rural road highways.
7
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.
8
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-sleepeyes stay open, brain not processing
  information

9
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

10
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

11
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

12
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

13
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

14
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

15
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

16
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

17
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

18
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

19
I N S T A L L A T I O N
Rumble Strips in District 3
20
I N S T A L L A T I O N
21
I N S T A L L A T I O N
22
I N S T A L L A T I O N
23
I N S T A L L A T I O N
24
I N S T A L L A T I O N
25
Sweeps up debris
I N S T A L L A T I O N
26
(No Transcript)
27
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

28
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

29
Challenge to Materials Engineers
T H E F U T U R E

• Next day, fog seal of macro surface covered up
  tape pavement markings2.12 /ft material
  investment covered (tape was 5 years old)
• So far I have not heard of any contractor paying
  for ruining pavement markings

30
Questions or Comments
QA
31
Building More. Building Faster. Moving Better.