Regulatory sign
Maximum height sign
What does the Maximum height sign mean?
A height in a red ring: no vehicles over the height shown may pass. It is unlawful for an overheight vehicle to pass it.
Also known as: Height limit sign, No vehicles over height shown
What it means
No vehicles over the height shown.
The red ring makes this an order. Vehicles taller than the height shown must not pass the sign.
These signs are used at non-arch bridges, placed on the bridge and at the side of the road before it.
Where you'll see it
At and before low non-arch bridges and other height restrictions.
Rules to know
At non-arch bridges mandatory signs may be used; it is unlawful for an overheight vehicle to pass one of these. They are placed on the bridge and at the side of the road in front of the bridge.
Know Your Traffic Signs, p. 24
You must obey traffic signs that give orders.
The Highway Code, Rule 109
Common mistakes
Mistake: Thinking the triangle and the red ring mean the same.
Instead: The red ring is a legal limit; the triangle warns of the headroom.
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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.
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- Know Your Traffic Signs (Department for Transport, Sixth edition, 2023), Low bridge signs, p. 24
- The Highway Code, Rule 109
Sign image: Department for Transport, Traffic sign images (diagram 629.2A). © Crown copyright, reused under the Open Government Licence v3.0.
Last reviewed 11 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