TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 465: Permanent Signs Mounted on Median Barriers reports on the current state of practice for mounting permanent highway signs on top of rigid median barriers throughout the United States.
National Academies of Sciences, Engineering, and Medicine. 2014. Permanent Signs Mounted on Median Barriers. Washington, DC: The National Academies Press. https://doi.org/10.17226/22344.
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