oklahoma’s experience with wire rope safety fence
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Oklahoma’s Experience with Wire Rope Safety Fence. In Oklahoma, median crossover accidents have increased. State Under Pressure - PowerPoint PPT PresentationTRANSCRIPT
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Oklahoma’s Experience with Oklahoma’s Experience with Wire Rope Safety FenceWire Rope Safety Fence
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• In Oklahoma, median crossover accidents have increased.
• State Under Pressure
• In response to the increase in median crossover accidents, in 2006 ODOT initiated a program to install wire rope safety fence at critical locations through out Oklahoma.
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First Installation in OklahomaFirst Installation in OklahomaLake Hefner ParkwayLake Hefner Parkway
Opened in 1991 6 lane divided highway approximately
44’ grass median; no highway lighting 108,000 ADT (2000) Speed limit 65 mph Site of 185 Crossover accidents – 6
Fatal, 77 injured from June 1, 1997 through May 31, 2001
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Lake Hefner ParkwayLake Hefner Parkway Considered three options: concrete median
barrier, strong-post guardrail and cable barriers. Cost/mile for each option: Concrete median barrier: $500,000 Double-face W-beam guardrail: $105,000 Wire Rope Safety Fence-Socketed system:
$84,000 Selected the Brifen wire rope safety fence with
socketed system.
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Brifen Wire Rope Safety Fence Brifen Wire Rope Safety Fence BackgroundBackground
• Developed by Brifen Ltd. in the United Kingdom in 1989
• In use in over 30 countries and 1/2 of the states
• NCHRP-350 TL3 approved by FHWA in March 2001
• Licensed Brifen USA, Inc. in November 2002 Picture 1
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Brifen Wire Rope Safety Fence Brifen Wire Rope Safety Fence FeaturesFeatures
• 10’-6” (3.2 m) Post Spacing
• Four Rope High Tensioned System
• Aesthetically Appealing
• Minimal Deflection
• Socketed System – Easy to Repair
• Capable of Long Segment Length Between Anchors
• Proven Crash Testing and Real World Experience
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Brifen Wire Rope Safety Fence Brifen Wire Rope Safety Fence ApplicationApplication
• Center medians
• May be placed on either side of roadway
Basic Design CriteriaBasic Design Criteria• Recommend slopes of 6:1 or flatter
• Predictability of vehicle at impact with WRSF at normal height with all wheels still on ground
• Deflection less than 8 feet
• End anchors can be miles apart
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Brifen Wire Rope Safety Fence Brifen Wire Rope Safety Fence BenefitsBenefits
• Economical InstallationEconomical Installation• Socketed Line Post System – Typical $15.95 LF
• Driven Line Post System – Typical $ 12.00 LF
(Installed Costs)
• Low Occupant Ridedown AccelerationLow Occupant Ridedown Acceleration• NCHRP-350 TL3 Maximum - 20 G’s
• Brifen 898 kg Car - 4.0 G’s
• Brifen 2000 kg Pickup - 2.86 G’s
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Brifen Wire Rope Safety Fence Brifen Wire Rope Safety Fence Benefits Benefits (Continued)(Continued)
• High Tensioned Prestressed RopesHigh Tensioned Prestressed Ropes• Reduced dynamic deflection
• Reduced length of barrier damaged in crash
• Secondary hits successful between repairs
• Low maintenance costs
• Wire Rope Safety Fence Open DesignWire Rope Safety Fence Open Design• Visibility unobstructed through WRSF
• Debris blows through Fence
• Snow drift problem reduced
• Drainage unaffected by Wire Rope Safety Fence
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Brifen Wire Rope Safety Brifen Wire Rope Safety Fence Fence
Oklahoma City, OK - Lake Hefner ParkwayOklahoma City, OK - Lake Hefner Parkway• 1000 Linear Feet Installation in September 2000
• 7 Mile Installation in July 2001
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Brifen Wire Rope Safety FenceBrifen Wire Rope Safety Fence
Lake Hefner Parkway Lake Hefner Parkway SpecificsSpecifics
• Wire Rope Safety Fence installed in median 2 feet from existing southbound shoulder
• Asphalt widening under WRSF for weed barrier
• Seven miles in length
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Accident History—Accident History—2001 to 20062001 to 2006
•Since 2001, over 430 hits. In 2/3 of those Since 2001, over 430 hits. In 2/3 of those hits, driver kept going.hits, driver kept going.
• Injuries:Injuries:
Reduced from 77 injuries in 2001 to 8 Reduced from 77 injuries in 2001 to 8 injuries in 2006.injuries in 2006.
• Fatalities:Fatalities:
Reduced from 6 fatalities in 2001 to 1 fatality in 2006.
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Brifen Wire Rope Safety FenceBrifen Wire Rope Safety Fence Lake Hefner Parkway Lake Hefner Parkway
PhotosPhotos
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August 1, 2001 To December 1, 2002August 1, 2001 To December 1, 2002
Total Impacts: 141Total Posts: 665Avg Posts/Impact: 4.71
Brifen Wire Rope Safety FenceBrifen Wire Rope Safety FenceLake Hefner Parkway Lake Hefner Parkway
ImpactsImpacts
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Brifen Wire Rope Safety FenceBrifen Wire Rope Safety FenceLake Hefner Parkway Lake Hefner Parkway
ImpactsImpactsAugust 1, 2001 To December 1, 2002August 1, 2001 To December 1, 2002
Northbound Impacts: 44 Posts: 200 Average: 4.54
Southbound Impacts: 97 Posts: 465 Average: 4.79
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Brifen Wire Rope Safety FenceBrifen Wire Rope Safety FenceLake Hefner ParkwayLake Hefner Parkway
More ImpactsMore Impacts Picture 3Picture
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Brifen Wire Rope Safety FenceBrifen Wire Rope Safety FenceLake Hefner ParkwayLake Hefner Parkway
More ImpactsMore Impacts Picture 1
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Brifen Wire Rope Safety FenceBrifen Wire Rope Safety FenceTypical Vehicle DamageTypical Vehicle Damage
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Brifen Wire Rope Safety FenceBrifen Wire Rope Safety FenceTypical Vehicle Damage Typical Vehicle Damage
(Continued)(Continued)Picture 1 Picture
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Brifen Wire Rope Safety FenceBrifen Wire Rope Safety FenceSocketed SystemSocketed System
• Typical repair time under 30 minutes
• Only one person required
• No specialized tools (except tension meter on occasion)
• No lane closures required for heavy equipment
• Inexpensive – normally just a few posts
• There has been no damage to ropes or rigging screws in over 430+ impacts
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Brifen Wire Rope Safety FenceBrifen Wire Rope Safety FenceSocketed Option – Easy Socketed Option – Easy
RepairRepair
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I-35 in Norman:I-35 in Norman: Prior to wire rope safety fence Prior to wire rope safety fence
installation:installation: 7 fatalities, 39 injured (3 years)7 fatalities, 39 injured (3 years) Since installation (2005): NO fatalities, NO Since installation (2005): NO fatalities, NO
injuries. 140+ hits and several semi hits.injuries. 140+ hits and several semi hits. Installed in the center of the median; Installed in the center of the median;
required a 6:1 slope or flatter; adjustments required a 6:1 slope or flatter; adjustments to the median drainage structures.to the median drainage structures.
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10 minutes, no re-tensioning10 minutes, no re-tensioning