Quick answer
For most cars, UK speed limits are usually 30mph on many built-up roads in England, Scotland and Northern Ireland, 20mph on many restricted roads in Wales, 60mph on single carriageways and 70mph on dual carriageways and motorways, unless signs show otherwise.
Always follow posted signs. Local 20mph zones, school streets, roadworks, average speed cameras, smart motorway gantries and temporary limits override the standard national limits.
The road sign wins. If a sign shows a lower limit than the one you expected, follow the sign, not memory, sat-nav or other traffic.
Standard UK speed limits for cars
Built-up roads
Usually 30mph in England, Scotland and Northern Ireland where restricted-road rules apply, unless signs show another limit. In Wales, many restricted roads are 20mph unless signs show otherwise.
Single carriageways
Usually 60mph for cars where the national speed limit applies, unless a lower signed limit is displayed.
Dual carriageways
Usually 70mph for cars where the national speed limit applies, unless signs or local restrictions show a lower limit.
Motorways
Usually 70mph for cars, unless variable signs, roadworks, incidents or temporary restrictions show a lower limit.
20mph zones
Common near schools, residential areas, town centres and many restricted roads in Wales.
Temporary limits
Roadworks, events, incidents and smart motorway gantries can temporarily lower the legal limit.
Car speed limit quick table
England, Scotland, NI built-up roads
Usually 30mph unless signs show otherwise.
Wales restricted roads
Often 20mph unless signs show otherwise.
National single carriageway
60mph for most cars.
National dual carriageway
70mph for most cars.
Motorway
70mph for most cars unless signs show a lower limit.
Roadworks or temporary signs
Follow the signed limit, even if the normal limit is higher.
What the national speed limit sign means
The white circular sign with a black diagonal stripe means the national speed limit applies. It does not automatically mean 60mph or 70mph. The actual limit depends on the road type and the vehicle you are driving.
- ✓Cars on single carriageways: usually 60mph.
- ✓Cars on dual carriageways: usually 70mph.
- ✓Cars on motorways: usually 70mph.
- ✓Vans and towing vehicles: different lower limits may apply.
- ✓Signs override assumptions: if a lower limit is posted, follow the sign.
For more detail, read national speed limit sign meaning.
20mph roads in Wales
Many restricted roads in Wales have a default 20mph speed limit unless signs show another limit. That means a road that might feel like a 30mph road elsewhere can legally be 20mph in Wales.
Look for signs
Do not assume a road is 30mph because it has street lights. In Wales, check for 20mph and 30mph signs carefully.
Local changes can happen
Some roads may be signed differently depending on local decisions, so the posted limit is the one to follow.
Van speed limits UK
Many van drivers assume speed limits match cars, but standard vans often have lower limits on single and dual carriageways. The correct limit depends on whether the vehicle is a car-derived van, dual-purpose vehicle, standard van, goods vehicle or towing.
Standard van
Often 30mph built-up, 50mph single carriageway, 60mph dual carriageway and 70mph motorway.
Car-derived van
May follow car limits if it meets the correct classification.
Van with trailer
Usually lower limits apply, especially on motorways and faster roads.
Because classification matters, do not rely on appearance alone. Read van speed limits UK for the detailed guide.
Speed limits when towing
Towing a trailer or caravan can reduce the legal speed limit. It also changes how the vehicle handles, brakes and reacts to wind, hills and downhill sections.
- ✓Towing vehicles usually have lower limits on single and dual carriageways.
- ✓Motorway limits can also be lower when towing.
- ✓You should allow more stopping distance and avoid sudden lane changes.
- ✓Check your licence, vehicle weight, trailer weight and towing capacity before travelling.
Motorway and smart motorway speed limits
For most cars, the motorway limit is usually 70mph unless signs show a lower limit. On smart motorways, overhead gantries can display variable speed limits. These limits are enforceable when active.
Variable speed limits
Displayed limits may reduce because of congestion, weather, incidents, roadworks or lane closures.
Red X signs
A red X means the lane is closed. Do not drive in that lane.
Average speed sections
Average cameras measure speed across a distance, not just at one camera point.
Roadworks
Temporary limits in roadworks are still legal limits and are often camera-enforced.
Useful guides: smart motorway speed limits guide and average speed cameras: how they work.
Speed cameras and enforcement
Speed limits can be enforced by fixed cameras, mobile camera vans, average speed cameras, motorway cameras and police roadside checks.
- ✓Fixed cameras: often placed where speeding or collision risk is a concern.
- ✓Mobile cameras: can operate from vans, tripods or roadside positions.
- ✓Average speed cameras: calculate speed over a measured section.
- ✓Motorway cameras: may enforce variable limits and lane restrictions.
For more detail, read average speed cameras: how they work.
Speeding fines and penalty points
Speeding can lead to a fine, penalty points, a speed awareness course, court action or disqualification depending on the speed, road, circumstances and previous offences.
Minimum penalty
Usually a £100 fine and 3 penalty points.
More serious cases
Higher speeds can lead to larger fines, more points, court or a driving ban.
New drivers
New drivers can be at greater risk of licence revocation if they build up points early.
For a full breakdown, read speeding fine UK explained.
Common speed limit mistakes drivers make
- !Assuming the national speed limit sign always means 60mph.
- !Forgetting that many restricted roads in Wales are 20mph unless signs say otherwise.
- !Not realising many vans have lower limits than cars.
- !Ignoring temporary roadwork limits because the normal road limit is higher.
- !Missing smart motorway gantry limits.
- !Speeding through average speed camera zones after slowing for only one camera.
- !Assuming dual carriageway always means 70mph for every vehicle.
- !Relying only on sat-nav speed limits instead of road signs.
Speed limits are maximums, not targets
The legal speed limit is the maximum allowed in good conditions. It may still be too fast for the road, traffic, weather, visibility, vehicle condition or load.
- ✓Slow down for rain, fog, ice, standing water or poor visibility.
- ✓Allow more braking distance when towing or carrying heavy loads.
- ✓Reduce speed near schools, pedestrians, cyclists, horses and parked cars.
- ✓Drive to the road conditions, not just the posted limit.
Best practical advice
When you see a speed limit sign, treat it as the current rule for that road. When you see the national speed limit sign, think about the road type and the vehicle you are driving before assuming the number.
For everyday driving, the main traps are 20mph roads, van limits, temporary roadworks, smart motorway gantries, average speed zones and assuming a dual carriageway always means 70mph.
Helpful UK speed limit guides
Frequently asked questions
Is every built-up road 30mph?
No. Many built-up roads are 30mph in England, Scotland and Northern Ireland, but signs may show 20mph, 40mph or another limit. In Wales, many restricted roads are 20mph unless signs show otherwise.
Does the national speed limit sign mean 70mph?
Not always. For cars, it usually means 60mph on single carriageways and 70mph on dual carriageways and motorways.
Do vans follow the same limits as cars?
Not always. Many standard vans have lower limits on single and dual carriageways. Classification matters, so check the specific vehicle type.
Can cameras enforce temporary limits?
Yes. Temporary roadwork limits, average speed zones and motorway variable limits can be enforced.
What is the minimum speeding penalty?
The minimum penalty is usually a £100 fine and 3 penalty points, although more serious cases can lead to higher penalties.
Can I rely on my sat-nav speed limit?
No. Sat-nav speed limits can be outdated or wrong. Always follow road signs and current conditions.
What speed should I do in bad weather?
Drive below the limit if conditions require it. Rain, fog, ice, standing water, darkness and poor visibility can make the posted limit too fast.
Is a dual carriageway always 70mph?
No. It depends on signs, vehicle type and local restrictions. Cars may use 70mph where the national speed limit applies, but vans and towing vehicles may have lower limits.