Narrow bridge sign
A yellow diamond with two lines that pinch in. It warns of a bridge ahead that is narrower than the road leading to it.
How to read it
The MUTCD uses it ahead of a bridge or culvert 16 to 18 feet wide between its sides, or narrower than the lanes that lead to it, and may also use it where the shoulders narrow or disappear on the approach. Pennsylvania's manual adds that such a bridge generally has no shoulder.
Rules vary by state and country. This explains the sign's standard meaning in the U.S. Manual on Uniform Traffic Control Devices; it isn't legal advice.
Narrow or one lane
A narrow bridge still carries two lanes, as Florida's handbook puts it, with very little clearance. A bridge less than 16 feet wide gets a different sign, ONE LANE BRIDGE: only one vehicle fits at a time.
Read next
- Next in Road signsLow clearance signA yellow sign giving a height between two arrows. It warns of a bridge, tunnel or other structure ahead with limited headroom.
- The same shape in Army ranksFirst sergeant (E-8)Three chevrons above three arcs with a diamond between them are the insignia of a first sergeant (1SG), pay grade E-8 in the US Army and the senior NCO of a company.
More road signs
The same shape elsewhere
Browse symbols drawn with diamonds or lines.
Sources
- MUTCD 2009 Edition, Chapter 2C: Warning Signs and Object Markers, MUTCD 2009, Part 2, U.S. Federal Highway Administration, Sections 2C.20–2C.21
- Pennsylvania Driver's Manual, Chapter 2: Signals, Signs and Pavement Markings, Pennsylvania Department of Transportation, p. 15
- Official Florida Driver License Handbook, rev. 08/2023, Florida Department of Highway Safety and Motor Vehicles, p. 51
Researched, edited and approved by Rory Hansen before publishing. Last reviewed September 25, 2026. How we research
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