Guide for the Preservation of Highway Tunnel Systems (2015) / Chapter Skim
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82.1 Tunnel Systems The AASHTO Technical Committee for Tunnels (T-20) defines tunnels as "enclosed roadways with vehicle access that is restricted to portals regardless of type of structure or method of construction."(9)
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Description of Tunnel Assets 9 • Signs: Signs include traffic signs, over-height detection systems, pedestrian signs, variable message boards, lane signals, fixture control cabinets, and conduits. • Protective systems: These systems include steel corrosion, concrete corrosion, and fire protective coating systems.(10)
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