Warning sign
Falling or fallen rocks sign
What does the Falling rocks sign mean?
Warns that rocks may fall onto the road ahead, or may already be lying on it. Slow down and look well ahead.
Also known as: Rock fall sign
What it means
There is a risk of rocks falling from a slope or cliff beside the road, and of fallen rocks lying in the road.
The symbol shows a cliff with rocks breaking away from it.
Drive at a speed that lets you stop within the distance you can see to be clear, especially around bends where a rock could be hidden.
Where you'll see it
On roads below cliffs, cuttings and steep rocky slopes.
Rules to know
The sign warns of a risk of falling or fallen rocks.
Know Your Traffic Signs, p. 13
Drive at a speed that will allow you to stop well within the distance you can see to be clear.
The Highway Code, Rule 126
Common mistakes
Mistake: Only looking up for falling rocks.
Instead: Rocks that have already fallen are just as dangerous. Watch the road surface ahead, especially round bends.
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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
Road works
Temporary sign
Another warning triangle: works or an obstruction ahead.
See also
Steep hill downwards
Warning sign
Another sign for steep, hilly roads.
More warning signs
All warning signs
Sources
- Know Your Traffic Signs (Department for Transport, Sixth edition, 2023), Warning signs, p. 13
- The Highway Code, Rule 126
Sign image: Department for Transport, Traffic sign images (diagram 559). © 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