Preventing Lane Departures Rumbles and Mumbles

Transcription

1 Preventing Lane Departures Rumbles and Mumbles

2 What s the problem What have we been doing What s being studied What s the future

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4 It has long been thought that the majority of Fatal Head-On crashes has been passing related. In the 2008 Traffic Safety Fundamentals Handbook, the claim is that 90% of the fatal head-on crashes on two-lane facilities are passing related. More in-depth study has revealed that this is NOT the case

5 Fatal Head-On Crashes on All Rural Two-Lane Two-Way Roads in Minnesota Why was the vehicle over the centerline? N = 251

6 Fatal Head-On Crashes on All Rural Two-Lane Two-Way Roads System Class ( ) in Minnesota Number of Fatal Crashes Number of Fatalities Percent (%) of Fatal Crashes Total US Route Trunk Highway % Minnesota (MN) Trunk Highway % County State Aid Highway (CSAH) % Municipal State Aid Highway (MSAS) % County Road (CR) % Township %

7 Fatal Head-On Crashes on All Rural Two-Lane Two-Way Roads in Minnesota

8 Fatal Head-On Crashes on Rural Two-Lane Two-Way Highways in Minnesota

9 Fatal Run-Off-the-Road(ROR) Crashes on All Rural Two-Lane Two-Way Roads in Minnesota What manner did the vehicle depart its lane? Primary ( ) Number of Crashes Percent of Crashes Drifting over edge-line % Loss of Control % Total %

10 Fatal ROR -Crashes on All Rural Two-Lane Two-Way Roads Secondary Contributing Factors ( ) in Minnesota What else contributed to the vehicle leaving its lane? Number of Fatal Crashes Percent of Crashes Rollover % Curve % Alcohol use / Chemical Impairment % Speed % Weather Related % Inattention/Sleeping 8 2.7% Other % Total % Not all crashes had a secondary factor, some had multiple

11 Fatal ROR -Crashes on All Rural Two-Lane Two-Way Roads Description of Item Hit ( ) Fatal Crashes Fatalities Percent of Fatal Crashes Driveway/ Embankment % Tree % Utility Pole % Submerged/Water % Bridge/Structure % Guardrail % Culvert % Other % Total Crashes %

12 Fatal ROR -Crashes on All Rural Two-Lane Two-Way Roads System Class ( ) Number of Fatal Crashes Number of Fatalities Percent (%) of Total US Route Trunk Highway % Minnesota (MN) Trunk Highway % County State Aid Highway (CSAH) % Municipal State Aid Highway % (MSAS) County Road (CR) % Municipal/Township/Other %

13 Fatal ROR -Crashes on All Rural Two-Lane Two-Way Roads

14 Fatal ROR -Crashes on Rural Two-Lane Two-Way Highways Direction of Departure Fatal Crashes Fatalities Percent of Crashes Right % Left % Right then Left % Left then Right % Total Crashes %

15 Fatal ROR -Crashes on Rural Two-Lane Two-Way Highways These data were analyzed to find differences between run-off-the-road right and run-off-the-road left crashes. It was found that none of the crashes and categorical groupings had a statistically significant difference between the vehicle crashing to the right or to the left.

16 Recommendations for Reducing Fatal Crashes in Minnesota Centerline AND Edge-line Rumbles on all two-lane roads with an ADT>400 Buffer width for roads with ADT>2,000 Remove trees from clear-zone, and beyond if possible Eliminate access points or reduce entrance slopes Delineate and Rumble Horizontal Curves Continue to support counties and locals with this data and HSIP $$

17 Recommendations for Reducing Fatal Crashes in Minnesota Type of Crash Fatal Crashes Fatalities Head-On ROR Right ROR Left Total These types of crashes represent over 34% of all the fatalities on Minnesota roads from These types of crashes represent over 32% of all the fatalities on Minnesota Trunk Highways from (296 of 919 fatalities)

18 Fatal Head On and ROR -Crashes on Rural Two-Lane Two-Way Highways

19 Systematic and proactive Requires centerline rumbles on all rural, high speed roads with new surface Requires shoulder rumbles on all rural, high speed roads with new surface and 4 shoulder Concrete - not required for 2 years

20 Districts have been dealing with complaints Most cases public has gotten used to them But some locations of centerline rumbles have been removed

21 DTE may gap centerline rumbles near residential homes DTE may gap shoulder rumbles on the inside shoulder of curves if Safety Edge or wider shoulder installed Allows two 8 wide centerline rumbles on either side of centerline joint

22 Rumble Strip Noise Evaluation Ed Terhaar, Principal Traffic Engineer with Wenck Associates, Inc David Braslau with David Braslau Associates, Inc Report Summary

23 Different wavelengths and depths (8 wide) Caltrans 14 wavelength, 0 to ½ depth Sinnus 24 wavelength, ¼ (1/8 ) to ½ depth MnDOT standard

24 N Measurements-Jun5\Monitoring-Setup.ppt 32

25 California Design 33

26 Pennsylvania Design 34

27 Minnesota Design 35

28 Exterior LAeq (dba) Levels CALIFORNIA PENNSYLVANIA MINNESOTA NO STRIP 90 Sound Level (dba) C-Car30 C-Car45 C-Car60 C-Pick30 C-Pick45 C-Pick60 C-Semi30 C-Semi45 C-Semi60 P-Car30 P-Car45 P-Car60 P-Pick30 P-Pick45 P-Pick60 P-Semi30 P-Semi45 P-Semi60 M-Car30 M-Car45 M-Car60 M-Pick30 M-Pick45 M-Pick60 N-Car45 N-Pick45 N-Semi45 36

29 Interior LAeq (dba) Levels CALIFORNIA PENNSYLVANIA MINNESOTA NO STRIP 90 Sound Level (dba) C-Car30 C-Car45 C-Car60 C-Pick30 C-Pick45 C-Pick60 C-Semi30 C-Semi45 C-Semi60 P-Car30 P-Car45 P-Car60 P-Pick30 P-Pick45 P-Pick60 P-Semi30 P-Semi45 P-Semi60 M-Car30 M-Car45 M-Car60 M-Pick30 M-Pick45 M-Pick60 N-Car45 N-Pick45 N-Semi45 37

30 Both have higher sound levels than bare pavement, but much less nuisance noise Sinnus design less noticeable within vehicle

31 MnDOT typical details CL sinusoidal rumble Nov 2014.pdf

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33 To be researched: Different wavelengths, depths & widths To be determined by Technical Advisory Panel Motorcycle and bicycle traversability Noise internal and external to vehicles Goal: Minimize external nuisance noise while maintaining appropriate level inside vehicle ( 10 db increase)

34 District Traffic Jim Miles, Bill Pirkl, Mike Schweyen, Chad Erickson Industry John Holbert and Terry Kraemer Environmental Services Mel Roseen Counties Rich Sanders and Vic Lund State Aid Mark Vizecky Materials Bernard Izevbekhai Central Office Traffic Derek Leuer, Michelle Moser, Ken Johnson

35 Literature search: Winter 2014 Identify possible rumble designs: Winter 2014 Install test sections at MN ROAD: Spring 2015 Evaluate non-traditional vehicles: Summer 2015 Install sinusoidal rumble designs: Summer 2015 Conduct noise study: Summer/Fall 2015 Final report: Fall/Winter 2015

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43 14 wavelength Seemed to give higher level of noise inside vehicle Exterior sound for both wavelengths similar Determined options to be tested on volunteered construction project Two 8 wide with 14 wavelength pattern 14 wide with 14 wavelength pattern As above, but modify the depth of nadir

44 SP Designs to be installed on TH 18

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56 Motorcycle and bike traversability crunch numbers Noise study crunch numbers Report Modify Rumble Tech Memo Sinusoidal Rumble Design Different depths/widths possible

57 Sinusoidal Rumbles in MN Most are the modified Caltrans design

58 TH 19 Sinusoidal Rumble.JPG

59 TH 19 Standard Rumble Inside Car.MOV

60 TH 19 Sinusoidal Rumble Inside Car.MOV

61 TH 19 Car on bare pavement.mov

62 TH 19 Car on Standard Rumble.MOV

63 TH 19 Car on Sinusoidal Rumble.MOV

64 Car passing on standard rumble

65 Car passing on sinusoidal rumble

66 TH 63 Sinusoidal Rumble Install.JPG D6 Adam Wellner

67 TH 63 Sinusoidal Rumble in Concrete.JPG D6 Adam Wellner

68 TH 63 Standard Rumble in Concrete.JPG D6 Adam Wellner

69 Questions?