National Speed Limit Sign Meaning UK

Quick answer

For most cars in the UK, the national speed limit usually means 60 mph on a single carriageway and 70 mph on a dual carriageway or motorway, unless a lower limit is shown.

For many vans, the limit is lower: often 50 mph on single carriageways, 60 mph on dual carriageways and 70 mph on motorways. If you are towing, the limits are usually lower again.

The national speed limit is the maximum legal limit, not a target. Weather, traffic, bends, road layout and visibility may require a lower speed.

What does the national speed limit sign look like?

The national speed limit sign is a plain white circular sign with one black diagonal stripe running across it. You often see it when leaving a lower speed limit area, such as a 30 mph, 40 mph or 50 mph zone.

The sign means the national speed limit now applies. It does not tell you the exact speed by itself. You must know whether you are on a single carriageway, dual carriageway or motorway, and whether your vehicle has lower limits.

National speed limit for cars

For cars and motorcycles, the national speed limit is usually straightforward when no lower signs are shown.

A lower signed limit always takes priority. This includes roadworks, temporary restrictions, smart motorway signs, local speed limits and speed limits shown in a red circle.

National speed limit for vans

Many van drivers get caught out because van speed limits are not always the same as car limits. A standard goods van is usually limited to lower speeds on single and dual carriageways.

Car-derived vans may follow car speed limits, but not every small van qualifies. If you drive a van for work, delivery, trade use or hire, check the vehicle classification carefully.

Read the full guide here: van speed limits UK.

What if you are towing?

If you are towing a trailer or caravan, national speed limits are lower than normal car limits. For cars towing trailers or caravans, the limit is usually 50 mph on single carriageways, 60 mph on dual carriageways and 60 mph on motorways.

You also need to drive safely for the conditions. Crosswinds, heavy loads, poor visibility, downhill sections and wet roads may require speeds well below the legal maximum.

Single carriageway vs dual carriageway

The difference matters because the national speed limit changes by road type. A dual carriageway is not simply a road with two lanes. It normally has a physical central reservation or barrier separating traffic travelling in opposite directions.

If a road has street lighting, local lower limits may apply unless signs tell you otherwise. Always follow the speed limit signs shown on the road you are using.

Smart motorways and variable speed limits

On smart motorways, overhead gantries can show variable speed limits. If a lower number is displayed inside a red ring, that limit applies instead of the national motorway limit.

Do not assume the road is still 70 mph just because it is a motorway. Variable limits, lane closures and average speed cameras are common on busy routes and roadworks.

Read more in our smart motorway speed limits guide and average speed cameras guide.

Common mistakes drivers make

• !Thinking the national speed limit sign always means 70 mph.
• !Thinking it always means 60 mph.
• !Forgetting that many vans have lower limits than cars.
• !Confusing a two-lane single carriageway with a dual carriageway.
• !Ignoring temporary roadworks signs or smart motorway limits.
• !Forgetting towing limits when pulling a trailer or caravan.
• !Driving at the limit even when weather, traffic or visibility makes it unsafe.

Safe driving tips in national speed limit areas

• ✓Identify whether the road is single carriageway, dual carriageway or motorway.
• ✓Know your vehicle type, especially if driving a van, towing or using a work vehicle.
• ✓Look for lower signs after junctions, roadworks and village exits.
• ✓Slow down for bends, poor weather, farm entrances, pedestrians, cyclists and horse riders.
• ✓Leave extra space at higher speeds because stopping distance increases.
• ✓Remember the speed limit is the maximum, not a target.

Best plain-English advice

When you see the national speed limit sign, do not guess the number. First ask: what road am I on, what vehicle am I driving, am I towing, and are there any lower signs showing?

For a normal car, it is usually 60 mph on a single carriageway and 70 mph on a dual carriageway or motorway. For many vans and towing vehicles, the legal limit can be lower.

Related speed limit and driving guides

Frequently asked questions

Does the national speed limit sign always mean 70 mph?

No. For cars, it usually means 60 mph on single carriageways and 70 mph on dual carriageways and motorways. Vans and towing vehicles may have lower limits.

Does the national speed limit sign always mean 60 mph?

No. It means 60 mph for cars on single carriageways, but cars can usually travel at 70 mph on dual carriageways and motorways if no lower limit applies.

What is the national speed limit on a single carriageway?

For cars, it is usually 60 mph. For many vans, it is usually 50 mph. Towing vehicles are also usually limited to 50 mph.

What is the national speed limit on a dual carriageway?

For cars, it is usually 70 mph. For many vans and vehicles towing trailers, it is usually 60 mph.

What is the national speed limit on a motorway?

For cars, it is usually 70 mph. If you are towing, the motorway limit is usually lower. Variable motorway limits can also override the normal limit.

Can local speed limits override the national speed limit?

Yes. Posted speed limit signs, roadworks, smart motorway gantries and temporary restrictions override the standard national speed limit.

Can I be fined in a national speed limit zone?

Yes. You can be fined if you exceed the legal speed limit for your road type and vehicle type.

Is the national speed limit a target?

No. It is the legal maximum in suitable conditions. You should drive slower when road, traffic, weather or visibility conditions require it.