Warning sign
Opening or swing bridge sign
What does the Swing bridge sign mean?
Warns of a bridge ahead that opens or swings to let boats through. Be ready to stop if it is open.
Also known as: Lifting bridge sign
What it means
The bridge ahead can open, lift or swing aside for boats, so the road may be closed for a time.
The symbol shows part of the bridge raised above the water.
Look out for traffic signals or barriers at the bridge, and stop when they tell you to. Never try to cross while the bridge is moving.
Where you'll see it
Before bridges over canals, rivers and harbours that open for shipping.
Rules to know
The sign warns of an opening or swing bridge.
Know Your Traffic Signs, p. 12
Common mistakes
Mistake: Assuming the bridge is always open to traffic.
Instead: It can open for boats at any time. Watch for signals and barriers and be ready to stop.
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© Crown copyright. Free to reuse under the Open Government Licence v3.0, as long as the sign is reproduced accurately and not in a misleading context.
Related signs
See also
Quayside or river bank
Warning sign
Another warning about water beside the road.
Similar
Level crossing with barrier or gate
Warning sign
Another crossing where barriers can close the road.
More warning signs
All warning signs
Sources
- Know Your Traffic Signs (Department for Transport, Sixth edition, 2023), Warning signs, p. 12
Sign image: Department for Transport, Traffic sign images (diagram 529). © Crown copyright, reused under the Open Government Licence v3.0.
Last reviewed 6 October 2026. This page explains the sign in our own words; for the full rules, see The Highway Code. How we source and check content