Will my motorhome fit under this UK bridge? The 2026 height-check guide

By Rovee · Reviewed and updated 2026-07-10

To know whether your motorhome fits under a UK bridge: take the V5C height, add every roof addition (A/C unit, satellite dish, solar panels, roof rails), then add a 10 cm safety margin for resurfacing. Compare against the signed clearance — a red circular sign = mandatory limit (unlawful to pass overheight), a red triangular sign = warning. Newer UK signs show metric and imperial; older signs are imperial only. If your true height is within 10 cm of the signed clearance, find another route.

It's not the bridge ahead — it's the lane before it. The math is simple, and the math is forgiving, if you do it once and trust it. The bridges below are the ones that have caught motorhomes before; the methodology is what catches the one that isn't on this list.

The height-check math (do this once, trust it)

Three numbers, one sum:

• V5C height. The bare-vehicle factory height from the registration document. This is the floor of your real height, not the ceiling.
• Every roof addition, measured. A/C unit (typically 18–22 cm), satellite dish (8–15 cm), solar panels (5–10 cm), roof rack or bars (5–15 cm). If you can't remember what's on the roof, climb up and look — or ask the dealer for the post-fit measurement.
• 10 cm safety margin. Bridges are surveyed to nominal height; resurfacing reduces real clearance over time; signs can be slightly out of date. The margin catches all three.

Worked example. A 2.95 m coach-built with a 20 cm A/C unit is a 3.15 m vehicle for routing purposes. Against a 3.20 m signed bridge, the 5 cm gap is below the 10 cm safety margin — don't risk it. Against a 3.30 m signed bridge, the 15 cm gap is over the margin — proceed at normal speed, hands on the wheel, eyes on the structure. The math is the same every time.

Save the final number on a card in the glove box, in the nav app vehicle profile, and on the inside of the cab. Once measured, the height doesn't change unless you fit something new on the roof. The discipline is the doing it once.

Reading UK height-restriction signs

UK low-bridge signage is governed by the Department for Transport's Know Your Traffic Signs. There are two shapes and they mean different things:

• Red-bordered equilateral triangle with a height shown inside = WARNING sign. Advisory maximum headroom — driving past it while overheight is dangerous, but not in itself an offence.
• Red circle with a height shown inside, usually placed on or immediately before the structure = REGULATORY / MANDATORY sign. Driving an overheight vehicle past it is unlawful under the Road Traffic Act.
• At arch bridges, the signs include chord markings — short horizontal lines below the height number — showing that the available clearance varies across the carriageway. Road markings funnel taller vehicles into the highest section of the arch (usually the centre); single-vehicle-width arches have one passable line and the rest is restricted.
• All UK road bridges with clearance under 16'6" (~5.0 m) are normally signed in advance. If you're driving anything taller than a normal car, treat every unsigned low-clearance structure as suspicious and slow down.
• Signs erected after roughly 2016 carry metric (m) AND imperial (ft/in) both; older signs may be imperial only — a known trap for European-registered motorhomes used to all-metric signage at home.

The two shapes matter because they decide the consequence. A triangular sign you misread is a bent A/C unit and an insurance call. A circular sign you misread is an offence under the Road Traffic Act on top of the damage and delay. When in doubt: park before the sign, walk to it, do the conversion on paper, then move the rig.

A working list of UK low bridges that catch motorhomes

The 12 structures below are the ones that come up repeatedly in motorhome contexts — either through specific documented incidents involving motorhomes/caravans, or through council and Network Rail records of strikes on routes that motorhomes use. Cross-checked against BBC News regional coverage, Network Rail's bridge-strike data, council news releases, and the long-running motorhomefun.co.uk incident threads.

Why this list isn't (and can't be) complete

Network Rail logged 1,666 bridge strikes between April 2024 and March 2025 — roughly one every five hours, costing £12 million in damage and 186,384 minutes of rail delay (Network Rail). Most of those are HGVs and buses on A-road bridges that motorhomes also use; the failure mode is identical, even when the headline vehicle is different. A definitive list of every UK bridge a motorhome could hit would run to thousands of entries and would still be missing the new ones.

The data layer is also incomplete. The MaxHeight tag on OpenStreetMap is missing on around 30% of European bridges — the UK is better-tagged than the European average, but rural and minor structures still slip through. Roadworks and resurfacing reduce real clearance over time, and those changes lag the map by weeks. The table above is a starting point for the most-reported motorhome-relevant cases. The math at the top of this page plus a dimension-aware sat nav app is the durable defence.

When the data is wrong — and it sometimes is

Bridge data is wrong often enough to plan for. Mitigations come in two shapes: app-side and driver-side.

App-side. Most vehicle-aware apps let you report a missing or wrong restriction. Sygic has Map Reporter; TomTom has MapShare; OpenStreetMap-based apps (CoPilot, parts of CaraMaps) take direct OSM edits. Reports typically take days to weeks to land in routing updates. If you spot a wrong restriction on a route you'll use again, reporting it once helps every other driver who comes after you.

Driver-side. When the route enters a town centre, a rural side road, or any unfamiliar lane: slow down, drop the radio, read the signs. The app catches roughly 95% of low-bridge cases. The signs catch the last 5%, and the signs are always right when the map disagrees. If a circular red sign and your sat nav are saying different things, the sign wins — every time.

Which apps catch the height before you do

Dimension-aware navigation is the layer between your measured height and the bridge ahead. The apps that route a motorhome around UK low bridges using vehicle dimensions in 2026 are Sygic Truck & Camper, CoPilot Caravan, TomTom GO Navigation in Camper mode, CaraMaps Premium, and Rovee (closed beta). The consumer apps — Google Maps, Apple Maps, Waze — route every vehicle as a car and will send a motorhome under a bridge it can't clear.

For the full per-app matrix (height + width + weight + narrow-lane + offline + pricing), see the parent guide: Motorhome route planner: avoid low bridges, narrow lanes, weight limits (2026). The same apps cover UK and European routing.

Rovee routes for the rig — height, width, weight, length — and combines UK low-bridge data with European toll, vignette, and low-emission-zone awareness in one CarPlay-friendly app. Closed beta now, public launch Friday August 7, 2026.

Join the waitlist for the public launch.

FAQ

How do I know if my motorhome will fit under a UK bridge?

Take the V5C registration height and add every roof addition — A/C unit (typically 18–22 cm), satellite dish (8–15 cm), solar panels (5–10 cm), roof rails or rack. Add a 10 cm safety margin on top. That's the number to compare against the signed clearance. A red circle on the sign means the limit is mandatory under the Road Traffic Act; a red triangle means it's a warning. If your true height is within 10 cm of the signed clearance, don't risk it — find another route.

What's the 10 cm safety margin for?

Bridges are surveyed to nominal height. Road resurfacing — a fresh layer of tarmac, a raised manhole, a temporary speed bump — reduces real clearance by a few centimetres at a time, and those changes lag the map for weeks or months. The 10 cm safety margin catches both the survey tolerance and the resurfacing drift. If you can clear a bridge with less than 10 cm to spare on paper, the answer at the bridge itself is "no".

My V5C says one height but the dealer brochure says another — which one wins?

The V5C plus your actual roof additions wins. Brochures often quote the bare-vehicle height — the factory line off the production floor before any options are fitted. A/C units, satellite dishes, solar panels, and roof rails all add to the real height that has to clear the bridge. A 2.95 m brochure-spec coach-built with a 20 cm A/C unit and 8 cm solar panels is a 3.23 m vehicle for routing purposes. The bridge doesn't read the brochure.

What's the difference between a circular and a triangular UK height sign?

Circular (a red ring with the height inside, usually mounted on or immediately before the structure) is a mandatory regulatory sign — driving an overheight vehicle past it is an offence under the Road Traffic Act. Triangular (red-bordered equilateral triangle with the height inside) is a warning sign — it tells you the maximum advisable headroom is approaching. Passing while overheight on a triangular sign is not itself an offence, but it is dangerous and may still lead to charges if you hit the structure. Both signs are placed in advance of the bridge; the circular sign is the one that decides whether you commit.

My motorhome is European-registered and the sign only shows feet and inches — what now?

Convert before you commit. 1 ft = 0.305 m and 1 inch = 2.54 cm, so a "9'0\"" sign = 2.74 m, a "10'0\"" sign = 3.05 m, and "12'6\"" = 3.81 m. UK signs erected after roughly 2016 typically show metric and imperial both; older signs are imperial only — a known trap for European-registered motorhomes used to all-metric signage at home. The conversion is unforgiving. If you're not sure, don't proceed: park, walk to the sign, do the math on paper before you move the rig.

My bridge isn't in the table above. How do I check it?

The table is a starting point, not a complete list — there are over a thousand UK bridge strikes a year and most don't involve motorhomes, but every one is a bridge that didn't announce itself loudly enough. Use a dimension-aware sat nav (Sygic Truck & Camper, CoPilot Caravan, TomTom GO Camper, or Rovee in beta) with your full vehicle height entered, including roof kit and the 10 cm margin. On an unfamiliar road, slow down and read the physical signs — they win when the map disagrees. The app catches roughly 95% of these; the signs catch the last 5%.

When can I get Rovee?

Rovee is in closed iPhone beta in 2026, with public launch on Friday August 7, 2026. Founding-member access is capped at the first 1,000 members at €17.99/year price-locked as long as you stay subscribed. The app routes for the rig — height, width, weight, length — and combines UK low-bridge data with European toll, vignette, and low-emission-zone awareness in one CarPlay-friendly app. Join the waitlist below.