Warning sign
Steep hill downwards sign
What does the Steep hill downwards sign mean?
Warns of a steep downhill gradient ahead. The figure shows how steep it is: 10% is the same as a gradient of 1 in 10.
Also known as: Steep descent sign, 10% hill sign
What it means
The road ahead goes steeply downhill. Slow down before the descent and choose a gear that helps you keep your speed under control.
The percentage is the gradient. A 10% hill is equivalent to 1:10, and the official example shows 10%.
Plates may be used with the sign, for example telling you to use a low gear or to try your brakes before going down. A similar sign shows a steep hill upwards.
Rules to know
Steep hill downwards: 10% is equivalent to 1:10.
Know Your Traffic Signs, p. 12
Plates such as 'Try your brakes' may be used with steep hill signs before a descent.
Know Your Traffic Signs, p. 12
Common mistakes
Mistake: Starting the descent too fast and relying on the brakes.
Instead: Slow down before you go over the top, and use a lower gear, as the plates with the sign may advise.
Test yourself
Recalling the answer helps it stick. Pick an answer to see how you did.
Question 1 of 1
What does this sign mean?
Full road sign quizzes are coming soon. See what's planned
Download this sign
© 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
Slippery road
Warning sign
Another warning about the road ahead.
More warning signs
All warning signsSources
- Know Your Traffic Signs (Department for Transport, Sixth edition, 2023), Warning signs, p. 12
Sign image: Department for Transport, Traffic sign images (diagram 523.1). © Crown copyright, reused under the Open Government Licence v3.0.
Checked against these sources and reviewed by Bikash Thapa, full UK driving licence holder. Last reviewed 4 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