Permanent Signs Mounted on Median Barriers (2014) / Chapter Skim
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8 CHAPTER TWO SIGN AND BARRIER DESIGN CRITERIA AND GUIDELINES Issues related to mounting signs on rigid median barriers are discussed, to varying degrees, in a number of pertinent national highway design specifications, policies, manuals, and guidelines. These documents provide a wealth of information to highway designers and other practitioners, and promote sound and consistent application of the latest technology throughout the national transportation infrastructure.
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9 ever, the availability of existing structures at desired placement locations is typically very limited (AASHTO 2011)
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10 NCHRP Report 350 (Ross et al.
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11 In many cases, the effective test level of the barrier is questionable in the vicinity of a sign support that is mounted within a ZOI. For example, a normally rated TL-4 barrier may effectively be reduced to TL-2 where a sign is mounted within the ZOI, because the support could cause failure of standard TL-3 and TL-4 tests at that location along the barrier.
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