Permanent Signs Mounted on Median Barriers (2014) / Chapter Skim
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Pages 27-29
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25 CHAPTER FIVE CONCLUSIONS AND RESEARCH NEEDS (813 mm)
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26 decisions must be made on a case-by-case basis by individual designers. In addition to explaining the ZOI and its potential effects on barrier performance, the latest edition of the AASHTO Roadside Design Guide describes a number of treatments that can be used to reduce ZOI exposure (AASHTO 2011)
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From page 29... ...
27 Additionally, there may be a need to evaluate possible effects on driver expectations and behavior resulting from implementation of treatments intended to reduce ZOI exposure. Modifications to signs, supports, and locations might impair visual recognition and thus reduce their effectiveness in conveying vital information to drivers.
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