The UK uses miles per hour, with a default of 30 mph in built-up areas, 60 mph on single carriageways outside towns, and 70 mph on motorways and dual carriageways. Wales lowered its urban default to 20 mph in 2023, the largest national change in decades.
Speed limits at a glance
| Road type | Limit |
|---|---|
| In built-up areas (cities, towns) | 30 mph (48 kph) |
| Residential / school zones | 20 mph (32 kph) |
| Outside built-up areas (rural) | 60 mph (97 kph) |
| Motorways / expressways | 70 mph (113 kph) |
About speed limits in United Kingdom
The UK is unusual in Europe for keeping mph rather than kph. Road signs show mph numerically without unit text — UK drivers are expected to know the units from context. EU visitors must be careful: a sign reading "60" on a country road means 60 mph (96 kph), not 60 kph.
Wales reduced its default urban speed limit from 30 mph to 20 mph (48 to 32 kph) in September 2023, becoming the first UK nation to do so. The change faced a significant public petition (470,000 signatures against), but the data after one year showed measurable reductions in serious-injury collisions. Scotland and England retained the 30 mph default as of 2026, though many English councils have adopted 20 mph zones for specific streets.
Motorway limits are typically 70 mph but several "smart motorway" sections use variable signs. The signs are legally binding when displayed: a 50 mph variable limit on the M25 is enforced by camera. Smart motorway hard-shoulder running was paused in 2023 after safety reviews; existing dynamic-lane motorways continue to operate.
New drivers (under 2 years post-test) face stricter penalty thresholds: 6 license points within 2 years results in automatic license revocation and requirement to retake the test. Many young UK drivers lose their license to speeding within the first 24 months for this reason.
Enforcement
The UK uses fixed Gatso, Truvelo, and Vector cameras extensively, plus average-speed cameras (SPECS) across long stretches of A-roads and motorway roadworks. Average-speed cameras catch many drivers who slow for fixed cameras then accelerate; the system records you at multiple points and computes average pace over the section.
Tolerance
The ACPO (now NPCC) guideline is 10 percent plus 2 mph before prosecution: 35 mph in a 30 zone, 79 mph on a 70 motorway. This is guidance, not law — individual forces vary and cameras typically trigger at 35 mph in a 30. School zones and roadworks are enforced more strictly.
Fines for speeding
Standard speeding fine is a £100 fixed penalty and 3 license points. Court referral (for serious offenses, 30+ mph over) can mean fines up to 175 percent of weekly income, plus potential disqualification. 12 points in 3 years means a totting-up ban (6 months minimum).
Frequently asked questions
What is the UK motorway speed limit?
70 mph (113 kph) is the standard motorway and dual-carriageway limit. Smart motorway variable signs can lower this to 60, 50, or 40 mph; the variable signs are legally binding and enforced by camera. There is no separate lower limit for towing or larger vehicles on motorways except for HGVs over 7.5 tonnes (60 mph).
Why does Wales have a 20 mph default?
In September 2023, Wales lowered its urban default from 30 mph to 20 mph (48 to 32 kph) to reduce pedestrian fatalities. Year-one data showed measurable reductions in serious-injury collisions, though enforcement was uneven and the policy remained politically divisive. Scotland and England kept the 30 mph default but increased 20 mph zones in specific streets.
Can UK speed cameras ticket me without seeing my face?
Yes. The registered keeper of the vehicle is sent a Notice of Intended Prosecution; they must identify who was driving. Failure to identify the driver is itself an offense (six points plus £1,000 fine). Some keepers contest tickets by proving they were not driving, but this requires the actual driver to come forward.
What is a smart motorway in the UK?
Smart motorways use technology to control traffic flow: variable speed limits via overhead gantries and historically the use of the hard shoulder as a running lane during congestion. Following safety reviews, dynamic hard-shoulder running was paused in 2023. All-lane-running smart motorways continue but with more frequent emergency refuge areas added.
Related tools
- Convert MPH to KPH — convert any speed reading between units.
- Car speed test — verify your speedometer accuracy.
- Live GPS speedometer — see your actual speed in the browser.
- Stopping distance calculator — how far you need to brake from each speed.