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LOW COST SYSTEMATIC SAFETY IMPROVEMENTS

LOW COST SYSTEMATIC SAFETY IMPROVEMENTS. Sue Groth Mn/DOT Sue.Grothdot.state.mn.us. Impact of SAFETEA-LU. Shift in Focus From total Crashes to Fatal and Serious Injury Crashes From higher cost site specific projects to lower cost systematic projects (proactive-reactive)

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LOW COST SYSTEMATIC SAFETY IMPROVEMENTS

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  1. LOW COST SYSTEMATIC SAFETY IMPROVEMENTS Sue Groth Mn/DOT Sue.Grothdot.state.mn.us

  2. Impact of SAFETEA-LU • Shift in Focus • From total Crashes to Fatal and Serious Injury Crashes • From higher cost site specific projects to lower cost systematic projects (proactive-reactive) • Focus on lane departure and intersection improvements • Shift in funding Federal Safety Programs (FY 2009 and beyond) • From Decentralized to Centralized • State – Local split based on F & A data • Stand alone projects only

  3. Edge Treatments • Rumble Strips and StripEs • Minnesota Local County Roads • $1.9M in Enhanced Striping funded in 2009/2010 • $3.5M in 6” Wide Pavement Markings funded in 2009/2010 • $1.5M in Rumble StripEs/Strips funded in 2009/2010 • Minnesota Trunk Highways • $1.6M planned in Rumble StripEs in 2009/2010 • 98 miles of Wet Reflective Markings installed 2008 • 310 miles of Rumble StripEs installed 2008 • 328 miles of 6” Wide Pavement Markings installed 2008 Office of Traffic, Safety and Technology

  4. Edge Treatments I-94 in Maple Grove • Safety Edge • Proven strategy Freeborn County • Cable Median Barrier • 139 Miles installed • 96 Miles planned for 2009-2011 • First before/after study is very promising Office of Traffic, Safety and Technology

  5. Edge Treatments • Horizontal Curves • Lane departure crashes more frequent • Potential countermeasures • Chevrons/delineation • Rumble Strips • Wider markings • Dynamic Feedback Signs Office of Traffic, Safety and Technology

  6. CSAH 13 SE MN ~ Enhancing Your Curves

  7. SE MN ~ Enhancing Your Curves CSAH 22

  8. Intersections • Rural Lighting • Improved signage systems • Active warning systems • Sight Distance improvements • “Black spot” improvements • J-turns • Roundabouts

  9. Systematic Signing for minor leg of intersection Add can delineators to Stop sign Stop Bar, 12” to 24” wide, 8’ to 12’ back from edgeline 36”, reserve 48” for intersections with documented deficiency and where there are RR grade crossings on the CH approach ½ distance between Stop Ahead and Stop • Prioritized/Phasing • Stop bar • Stop sign • Junction sign • Stop Ahead Message • Stop Ahead Sign Provide three devices indicating up coming intersection ½ distance between Stop Ahead and Junction sign 450’ (min.) to 750’ back, 1 size larger than Stop (up to 48”)

  10. Active Warning Sign

  11. Active Warning Sign

  12. Intersection Warning SystemCR 47 and Lawndale Lane

  13. Questions? Thank-you

  14. Texas – Meg MooreShoulder Rumble Strips

  15. Edgeline Rumble Strips

  16. Centerline Rumble Strips

  17. Horizontal Signing

  18. Fluorescent Yellow Sign Sheeting

  19. Cable Barriers in Texas

  20. Washington State Highways Centerline Rumble StripsBefore and After Look • Preliminary evaluations of 518 miles of centerline rumble strips that have been in place six months or longer indicate: • 28% reduction in all fatal and serious injury collisions • 26% reduction in all cross-centerline collisions • 50% reduction in fatal and serious injuries resulting from cross- centerline collisions.

  21. Washington State HighwaysCable Median BarrierBefore and After Look • Cable median barriers are installed to reduce the risk of vehicles leaving the roadway and striking hard objects, steep slopes, bodies of water, or crossing into oncoming traffic. • While it is not possible to prevent all crossover collisions or vehicles leaving the road, cable barriers on the roadside or in the median help reduce the risk of very severe collisions. • WSDOT installed 43 miles of cable median barrier in 2007, bringing the statewide total to 177 miles. WSDOT engineers analyzed the performance of the state’s cable median barriers from 1995 through 2007 by reviewing nearly 2,550 collisions in the median. They found: • • A 62% reduction of serious injury and fatal collisions (24.8/ year to 9.5/year after installation). • • Annual cross median collisions decreased 73%.

  22. Washington State HighwaysCable Median BarrierEffect on cross-median incidents

  23. Washington State HighwaysReducing fatalities and serious injuries on rural two-lane roads • Although serious injuries on state highways and interstates have declined by 10.6% from 659 in 2002 to 568 in 2007, the number of serious injuries and fatalities on rural two lane state highways increased 14% (37) from 2005 to 2007. • WSDOT analyzed the type and direction (run off the road, crossing the centerline) of each of these incidents, and subsequently developed location specific strategies. • To improve safety, WSDOT has undertaken a series of location specific solutions to prevent and reduce the severity of serious injuries and collisions. On highways with a number of cars running off the road, WSDOT has initiated or planned roadside safety improvements, such as replacing or adjusting guardrail, replacing deficient signing or restoring sight distance at intersections, to reduce the frequency and severity of collisions and improve motorist safety.

  24. Nevada – Fred Droes • Rumble Strips – All shoulders four foot or wider, $1.9 Project to install centerline rumble strips on 1300 miles of rural roads, concerns with placement and impact on pavement integrity

  25. Nevada • Rumble Stripes – Started on the interstate, looking at other locations • Median Barriers – Beginning use of cable median barrier • Recovery Area – Project developed to flatten slopes, developing a statewide list of potential projects to widen shoulders and flatten slopes • Curve Treatments – Evaluating the placement of traffic paint on vertical surfaces such as guardrail and barrier, Ultra Guard from Potters Industries

  26. South Dakota – John Alder A large percentage of fatal crashes are single car run off road – Improvements aimed at this problem include: • Wider edge lines, 8” vs. 4”, on rural roads with narrow or no shoulders • Delineation along more routes – helps with inclement weather and at night • Upgraded sign sheeting (DG3) on certain signs including NO PASSING ZONE signs • Tried deer reflectors with mixed results

  27. Maryland – Tom Hicks

  28. Kentucky – Jeff Wolfe • Rumble Stripes – Only installed centerline rumble stripes on selected routes to date. Expanding use on two-lane rural roads with 12’ lanes • Rumble Strips - Has installed shoulder rumbles (pavement texturing) for years on the shoulder wedge (rolled in). Pilot project this year (10 locations, 60 miles) to relocate shoulder rumble to the lane edge – rumble stripe • Skid Treatment – Three Tyre Grip projects to address lane departures on rural curves • Advanced Warning End of Green Flashers – becoming common in mountainous regions on high-speed corridors

  29. Traffic Engineering Countermeasures to Improve Safety Every One Counts Safety Summit February 10, 2009 Mike Manthey, P.E. State Traffic Engineer Arizona Department of Transportation

  30. Roadway Departure • Wider, durable pavement markings • Reflective pavement markers • Rumble strips • Cable barrier • Guardrail end treatments • Roadside/guardrail delineators

  31. Intersections • Signal heads • Pedestrian countdown signals • Access management • Transverse rumble strips • Street name signs • Speed feedback signs • Roundabouts

  32. Freeways • Directional signing • Route decals • Lighting • Raised pavement markers

  33. Pavement Markings • 6-inch wide lane and edge lines • Durable • 3% CRF (from 4 to 6 inch)

  34. Reflective Pavement Markers (RPMs) • 16% nightime crashes • Freeways: left edge line (20-foot spacing) and lane lines (40-foot)

  35. RPMs • Recessed in groove for snowplow areas

  36. Rumble Strips • 25% CRF head-on/sideswipe (centerline) • 18 to 35% road departure (shoulder)

  37. Cable Barrier • 90% CRF for freeway cross-median crashes

  38. Guardrail End Treatments • System-wide replacement of BCTs

  39. Roadside/Guardrail Delineators • 25% CRF • Initiating statewide roadside delineator project • Texas Transportation Institute spacing • Maintainable system

  40. Signal Heads • Larger (42% CRF for angle crashes going from 8 to 12 inch LED lens) • Backplates and visors (20% to 50% CRF) • Optic (15% CRF)

  41. Pedestrian Countdown Signals • 25% CRF for pedestrian crashes

  42. Access Management • Statewide Access Management Plan being developed • Raised medians 40 to 60% CRF

  43. Transverse Rumble Strips • 28% CRF for stop condition

  44. Street Name Signs • Easier to read • Clearview font • Capital and lower case letters • Advance Street Name signs

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