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Traffic Barriers Design

Chapter 1610 (pdf) of the WSDOT Design Manual provides guidance for the different barriers, terminals and transitions that WSDOT uses.

Barriers

Cable Barrier In-Action

Cable Hit Cable Redirecting

Cable with Truck Typical Cable Barrier Installation

Standard Plans

Traffic Barrier: Information and Reports
Research

Brochures

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Aesthetic Barrier 

Length of Need Calculations

An Excel spreadsheet may be downloaded and used to calculate barrier length of need. (xls, 20 kb)

Terminals

Buried Terminal

The buried terminal is the preferred terminal because it eliminates the exposed end of the guardrail. The guardrail is anchored in a backslope that is 1V:3H or steeper and at least 4 feet in height.

Buried Terminal Type 2 is used when the foreslope is as steep as 1V:4H. A more abrupt flare is acceptible after the rail passed the bottom of the ditch. The height of the guardrail is maintained relative to the roadway and a rubrail is used along the exposed portion of the posts.

Standard Plan C-22.14 and Standard Plan C-22.16

Buried Terminal Type 2

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Nonflared Terminal

The Standard Plans identify proprietary nonflared terminal designs.  The Standard Plans do not show all of the details needed to construct these terminals. The Standard Plans supplement the manufacturers drawings which can be downloaded below.
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Manufacturer's Drawings
For use with 31 inch systems: 

Steel Post Systems:

Wood Post Systems:

Others:

For use with 27 inch systems:

Wood Post Systems

Manufacturer's plans of older nonflared terminal designs
Old Nonflared Terminal Manufacturer drawings

Flared Terminal

A flared terminal can be used where a buried terminal cannot be installed. These terminals are flared away from the traveled way which creates an offset from the tangent guardrail.

The Standard Plans identify acceptable proprietary flared terminal designs.  The Standard Plans do not show all of the details needed to construct these terminals. These Standard Plans supplement the manufacturers drawings which can be downloaded below.

Flared Energy Absorbing Terminal (FLEAT 350) Manufacturer's Drawings

Flared Energy Absorbing Terminal (FLEAT 350) Views:




SRT-350 Manufacturer's Drawings

  • SRT 350 (8 Post Design) (pdf, 136 kb)
  • The WSDOT has discontinued the use of the SRT 75. For low speed installations, the FLEAT-TL2 can be used.
    Manufacturer's plans of older SRT designs 
    Slotted Rail Terminal Manufacturer drawings: