What condition does this warning sign identify?

Correct answer: A – The roadway becomes narrower at a bridge ahead
A Narrow Bridge sign warns that the available roadway width decreases at the bridge or culvert ahead. It does not by itself indicate an unstable structure or establish one-way traffic. Drivers should recognize that side clearance may be limited, particularly when operating a wide commercial vehicle.
Source: Manual on Uniform Traffic Control Devices for Streets and Highways, 11th Edition with Revision 1 — Ch. 2C, “NARROW BRIDGE Sign (W5-2)”


