Roadway Design Issues

To help you determine the type of median barrier to use, begin with a review of our Lead States Team’s own analyses, including:

  • traffic volume and speed
  • vehicle mix
  • median width and cross slope
  • number of lanes
  • roadway alignment and crash history

Below are links to some States' information on their own background with Cable Median Barrier

North Carolina Information
Washington Information
Ohio Information
Texas Information
FHWA Information
Other States' Information


North Carolina Information

General Information

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Washington Information

General Presentations

Folio/Handout

Report

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Ohio Information

General Information

  • Implemented High Tension system (14 miles) in 2003

  • Cable design to be placed at a 10’ offset from the ditch centerline

  • Initial 14 mile segment - Cable placed on 6:1 slope with a 60’ median, ended up being a 14’ to 16’ offset from the ditch centerline, but due to median drainage issues, the placement ended up at 16' fromt he center ditch line

  • Went with non-socketed system to begin with and switched to socketed system because of the ease of repair of the socketed systems

  • Went with High Tension for limited deflection for tight median fits

  • Cable heights were mounted according to the cable manufacturer

  • Ohio does not have standards in place, each project is site specifically designed

General Presentations

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Texas Information

General Information

  • Implemented High Tension cable systems

  • Only use the High Tension cable systems in median applications

  • Require a deflection of less than 8’

  • Require a 6:1 slope, sometimes has to do a lot of regrading

  • Standard Details and Specifications available from DES-RDS

  • Used all concrete barrier until cable came around

  • Post spacing is 10’ to 16 ½’ from company to company to achieve less than 8’ deflection

  • Uses all milled Rumble Strips on all freeways

  • Takes the Cable Barrier behind the W-Beam

  • Barrier installation costs are as follows (barrier only)

    Ø High Tension (two companies) $12 per foot $4500 per end unit

    Ø High Tension (four companies) $9 per foot $2400 per end unit

     

  • Follows manufactures specifications for each barrier type

  • Always place at the shoulder point, 10’ to 12’ off the edgeline

Memo and Background Information

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FHWA Information

Report

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Other States' Information

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