In the United Kingdom, a triangular warning sign showing a black hump indicates a hump bridge.
The sign warns drivers that the road rises sharply over a bridge, potentially hiding approaching traffic, cyclists, pedestrians, or the road beyond. Drivers should reduce speed and be prepared for limited visibility.
It is distinct from the uneven-road warning sign, which depicts a bump-like irregular surface rather than a bridge profile. A steep-hill sign instead shows a vehicle on a pronounced incline or descent.
Hump bridges are often historic structures whose narrow decks and restricted sight lines make early warning especially important. The triangular shape identifies the sign as a warning sign in the UK, while the pictogram specifies the particular hazard.