This page lists of the various symbols in the Tunnels group.
The signs are used to indicate tunnels, where lights are usually required, and a general change in the light level. May also indicate low ceiling clearance. Truck drivers should also watch for prohibited cargo signs (e.g., Hazmat, propane, explosives) upon approach to tunnels.
Symbols in this group:
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"Tunnels Symbols." Symbols.com. STANDS4 LLC, 2023. Web. 4 Oct. 2023. <https://www.symbols.com/group/81/Tunnels>.