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Chapter 710 (pdf) of the WSDOT Design Manual provides guidance for the different barriers, terminals and transitions that  WSDOT uses. 

Barriers

Cable Barrier

Cable Barrier: Information and Reports

Aesthetic Barrier

FHWA Aesthetic Barrier site

Deception Pass Log Rail

An Excel spreadsheet may be downloaded and used to calculate barrier length of need.  English version Metric version

Terminals

Buried Terminal

Flared Terminal

Nonflared Terminal

New Research

Precast Concrete Barrier Design Survey

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