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NCHRP Project 17-35: Evaluation of Safety Strategies at Signalized Intersections

 

 

Evaluations of Low Cost Safety Improvements Pooled Fund Study

 

PPT version for Printing

Oklahoma’s Experience with Wire Rope Safety Fence


  • 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.

First Installation in Oklahoma’Lake 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

Lake 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.

Brifen Wire Rope Safety Fence Background

  • 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
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Brifen Wire Rope Safety Fence Features

  • 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 Application

  • Center medians
  • May be placed on either side of roadway
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Basic 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

Brifen Wire Rope Safety Fence Benefits

  • Economical Installation
    • Socketed Line Post System – Typical $15.95 LF
    • Driven Line Post System – Typical $ 12.00 LF
          (Installed Costs)
  • Low 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
  • High 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 Design
    • Visibility unobstructed through WRSF
    • Debris blows through Fence
    • Snow drift problem reduced
    • Drainage unaffected by Wire Rope Safety Fence

Brifen Wire Rope Safety Fence

Oklahoma 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 Fence Lake Hefner Parkway Specifics

  • 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—2001 to 2006

  • Since 2001, over 430 hits. In 2/3 of those hits, driver kept going.
  • Injuries:

    Reduced from 77 injuries in 2001 to 8 injuries in 2006.

  • Fatalities:

    Reduced from 6 fatalities in 2001 to 1 fatality in 2006.


Brifen Wire Rope Safety Fence Lake Hefner Parkway Photos

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Brifen Wire Rope Safety Fence Lake Hefner Parkway Impacts

August 1, 2001 To December 1, 2002
  Total Impacts: 141
Total Posts: 665
Avg Posts/Impact: 4.71
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Brifen Wire Rope Safety Fence
Lake Hefner Parkway Impacts

August 1, 2001 To December 1, 2002
Northbound
Impacts: 44
Posts: 200
Average: 4.54
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Southbound
Impacts: 97
Posts: 465
Average: 4.79
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Brifen Wire Rope Safety Fence Lake Hefner Parkway

More Impacts

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Brifen Wire Rope Safety Fence Lake Hefner Parkway

More Impacts

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Brifen Wire Rope Safety Fence Typical Vehicle Damage

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Brifen Wire Rope Safety Fence Socketed 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 Fence Socketed Option – Easy Repair

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  • I–35 in Norman:
    • Prior to wire rope safety fence installation:
      • 7 fatalities, 39 injured (3 years)
      • Since installation (2005): NO fatalities, NO injuries. 140+ hits and several semi hits.
      • Installed in the center of the median; required a 6:1 slope or flatter; adjustments to the median drainage structures.

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10 minutes, no re–tensioning

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