Bridge Signs

Because bridges are exposed to cold air on the top, the bottom, and the sides, they lose heat far faster than roads sitting on insulating ground — so they freeze while the rest of the road is only wet. That makes for hidden ice right on the span. The Bridge Ices Before Road sign (W8-13) warns drivers to ease off before they hit that patch.

A Narrow Bridge sign (W5-2) warns that the bridge is tighter than the approaching lanes but still carries both directions — drivers need to hold their line. A One Lane Bridge sign (W5-3) means the span fits only one direction at a time, so traffic has to take turns. For the second, a Narrow Bridge Yield sign sets who goes first.

Yes. You can specify the exact tonnage — "10 Tons," an axle-weight limit, or a combination limit — to match your engineer's rating for a private or municipal bridge. These are regulatory-style signs, essential for keeping heavy trucks from overstressing the structure. Browse weight limit signs or call for a custom rating.

For a structure that's failed or unsafe, use an emergency message: Bridge Out, Bridge Out Ahead, Bridge Washed Out — No Access, or Bridge Closed. Post these in advance with a detour so drivers can turn off before they reach a gap in the road.

Often yes. The Narrow Bridge sign (W5-2) applies to a culvert as well as a bridge when its roadway clearance is 16 to 18 feet or narrower than the approach lanes. A culvert is just a smaller drainage structure carrying the road over a pipe or channel, but a driver still needs the same "it gets narrow here" warning, so the same sign does the job.

An overhead low railroad bridge is signed with a low clearance sign (W12-2) posting the height, so tall trucks know whether they fit. That's a different hazard from a low GROUND clearance crossing, where a long trailer can bottom out on a raised track — which uses the Railroad Low Ground Clearance sign (W10-5). Match the sign to whether the risk is overhead or underneath.

Yes — many bridges carry a name or memorial-designation plaque, and we can produce a custom sign with the bridge's name, number, or dedication. These are identification signs rather than warnings, so they don't follow a warning color, but they're built on the same rust-proof aluminum.

If a bridge sign is damaged, faded, or missing on a public road, report it to the agency that owns the road — your city or county public works or the state DOT — with the exact location. For a private bridge, you replace it yourself. For a bulk order or a custom sign, call our sales team at 888-343-3771 (Mon–Fri, 8am–7pm EST) or email customerservice@smartsign.com.