A Focus Technology of the American Association of State Highway and Transportation Officials (AASHTO) Technology Implementation Group (TIG) CABLE MEDIAN.

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Presentation transcript:

A Focus Technology of the American Association of State Highway and Transportation Officials (AASHTO) Technology Implementation Group (TIG) CABLE MEDIAN BARRIER Best Practices Guidelines

Cable Median Barrier Share & Sponsor Technology Transfer Promote Transportation Advancements Encourage Implementation

Cable Median Barrier Why Median Barriers …. 200 Miles of Highway = 1 Crossover Fatality 250 Killed Annually in Crossover Crashes 23,139 Road Departure Fatalities 16,214 Fatalities from Run-Off-The-Road Crashes 740,000 Road Departure Injury Crashes 267 Crossover Head-On Fatal Collisions

Cable Median Barrier Safe Effective Cost Efficient Proven Results Replaceable What Is Cable Barrier …

Cable Median Barrier Why Cable Median Barrier? And Why Now? R E S U L T S

Cable Median Barrier 20 Reported Cable Median Barrier Impacts 0 Penetrations – 0 Crossover Fatalities First vehicle to impact cable barrier (March 2005) No Injuries Crossover Crashes Fatalities Cable Barrier Installed (May 2005 thru April 2006)

Cable Median Barrier Minimize Cross-Median Crashes Lower Deflection Rates Less Maintenance Residual Safety Value Lower Market Prices

Cable Median Barrier “For every one fatal across median crash there were 10 non-fatal across median crashes.” “Median Barriers in North Carolina,” AASHTO Subcommittee on Design, 2006

Cable Median Barrier Fatalities Fatal Crashes Across-Median Crashes Decreased or Eliminated Lives Saved Millions in Crash Cost Savings

Cable Median Barrier Generic Cable $8.33/Foot High Tension Cable $12.23/Foot W-Beam $13.65/Foot Pre-Cast Concrete$24.64/Foot Single Slope Concrete$44.94/Foot Cast in Place Concrete$79.36/Foot Issues & Concerns: Barrier Costs

Cable Median Barrier Issues & Concerns: The Choices Safence Trinity Cable Safety Systems (CASS) Brifen Wire Rope Safety Fence Gibraltar Cable Barrier Nucor Marion U.S. High Tension

Cable Median Barrier Issues & Concerns: Maintenance & Repair Barrier Hits Per Mile Cost Recovery Frequency of Repair Cable Downtime Moving Tension, Temperature & Elasticity

Cable Median Barrier Issues & Concerns: Roadway Design Cable Type Cable Placement Barrier Design Transition from Cable to Other Types of Systems

Cable Median Barrier Case Study: Utah Department of Transportation Lessons Learned:  Compacted surface  Facilitate winter maintenance and avoid erosion  Foundation sockets flush to ground  1:6 steepest slope  System hits effective

Cable Median Barrier Case Study: Ohio 6:1 Slope Socketed System Cable Heights High Tension System 10’ Offset from Ditch Centerline

Cable Median Barrier Case Study: North Carolina 8’ Offset at 60’ Median Widths Cable Height Design Specifications Median Barrier Drawings 70’ Median Width or Less 500 Miles of Low Tension Barrier 14’ Designed Deflection 4’ Offset from Ditch Line

Cable Median Barrier Case Study: Texas  High Tension Cable System  6:1 Slope  Standard Details and Specifications  Cable Barrier Behind W-Beam  10’ to 12’ Off Edgeline

Cable Median Barrier Case Study: Washington  Cable Height  Pre-Cast Concrete Barrier  NCHRP 350 Test Level 3  High Tension and Low Tension  6:1 Slope and 10” Offset  70 Miles in 8 Counties

Cable Median Barrier Issues & Concerns: Motorcycle Safety Barrier Performance Barrier TypeTotal CollisionsInjury CollisionsFatal Collisions Percent Percent Concrete 40 85% 7.5% Beam Guardrail % 9.2% Bridge Rail 10 80% 10% Washington State Highways,

Cable Median Barrier Resources Available: AASHTO TIG Web Site  Contact Information  Challenges  Roadway Design Issues  Maintenance Issues  Benefits & Evaluations  System Threats You’ll also find links to: Lead States Team Studies FHWA Evaluation Texas Transportation Institute Vendors And more ….

Cable Median Barrier Resources Available: The Lead States Team North Carolina Kevin Lacy(919) Terry Hopkins(919) Brian Mayhew(919) Shawn Troy(919) Brian Murphy(919) Roger Thomas(919) Scott Capps(919) Washington Dick Albin(360) Ohio Dean Focke(614) Utah Rob Clayton(801) Texas Rory Meza(512)

Cable Median Barrier Resources Available: For the Media

Cable Median Barrier Resources Available: Evaluations, Case Studies & More

Cable Median Barrier Resources Available: To Learn More Federal Highway Admininstration: Brifen U.S.A. Gibraltarhttp://gibraltartx.com Nucor Steel Marionhttp://nsmarion.com Safencehttp:// Trinityhttp:// AASHTO TIG