National Speed Limit on Dual Carriageways in the UK

Understanding National Speed Limit on Dual Carriageways in the UK

Speed limits are vital in ensuring road safety and smooth traffic flow. In the United Kingdom, different roads have varying speed limits to accommodate their specific characteristics. This blog post will comprehensively examine the UK’s national speed limit on motorways, including M1 traffic news, M6 traffic news, M25 traffic news, and M4 traffic news, two-lane and single-lane roads.

In the UK, dual carriageways are highways that physically divide traffic, usually with a central reservation or barrier. The national speed limit for automobiles, motorbikes, and other standard vehicles on dual carriageways is 70 mph or 112 km/h. The road, the weather, and any additional speed restriction signs must all be considered by drivers as they adjust their speed.

National Speed Limit on Single Carriageways:

One lane in each direction makes up single carriageways, which do not physically separate opposing lanes of traffic. On these routes, the maximum allowed speed for cars, motorcycles, and other conventional vehicles is 60 mph (97 km/h). There might be circumstances where the right signs show a lower speed restriction. To maintain traffic safety, paying attention to such signage is essential.

Also check What Do Red Light Cameras Look Like in the UK

 Road Speed Limit in the UK:

In addition to the national speed limits mentioned above, it is essential to be aware of varying speed limits that may be in place due to local conditions or road signage. These limits address specific factors such as densely populated areas, roadworks, schools, or hazardous stretches. Such limits reduce speed to enhance safety and minimize the risk of accidents. Always be attentive to speed limit signs and adjust your driving accordingly.

 National Speed Limit for Cars and Motorcycles on Motorways, Including M4 Traffic :

On motorways, which are high-speed roadways explicitly constructed for automobiles. It is illegal for pedestrians, cyclists, or drivers of vehicles that move more slowly to use those routes. The maximum legal speed for cars, motorcycles, and other regular vehicles traveling on highways in the UK is 70 miles per hour (112 kilometers per hour). However, you must never forget the variable speed limitations that may be temporarily applied due to traffic, road construction, or inclement weather. These speed limits may also change over time. The maximum speed allowed at that particular time is displayed on the above gantries, which function as temporary constraints.

All single and dual carriageways with street lights have a 30 mph (48 km/h) speed restriction unless signage indicates otherwise.

Also check: Joining A Motorway in the UK: What Should You Do Immediately

Built-up areas mph (km/h)

Single carriageways mph (km/h)

Dual carriageways mph (km/h)

Motorways mph (km/h)

Cars, motorcycles, car-derived vans, and dual-purpose vehicles30 (48)60 (96)70 (112)70 (112)
Cars, motorcycles, car-derived vans, and dual-purpose vehicles when towing caravans or trailers30 (48)50 (80)60 (96)60 (96)
Motorhomes or motor caravans (not more than 3.05 tonnes maximum unladen weight)30 (48)60 (96)70 (112)70 (112)
Motorhomes or motor caravans (more than 3.05 tonnes maximum unladen weight)30 (48)50 (80)60 (96)70 (112)
Buses, coaches, and minibusses (not more than 12 meters overall length)30 (48)50 (80)60 (96)70 (112)
Buses, coaches, and minibusses (more than 12 meters overall length)30 (48)50 (80)60 (96)60 (96)
Goods vehicles (not more than 7.5 tonnes maximum laden weight)30 (48)50 (80)60 (96)70 (112)
60 (96) if articulated or towing a trailer
Goods vehicles (more than 7.5 tonnes maximum laden weight) in England and Wales30 (48)50 (80)60 (96)60 (96)
Goods vehicles (more than 7.5 tonnes maximum laden weight) in Scotland30 (48)40 (64)50 (80)60 (96)



By reducing the likelihood of being involved in an accident, obeying posted National Speed limit improves traffic flow and road safety on major routes like the M1, M2, M4, and M25. Always remember the federal speed limits in the UK when you are on your way. These limits are different for different kinds of roads. These are different for dual carriageways, single carriageways, and motorways, so it is essential to pay attention to them. In addition, be ready for any temporary or regional speed restriction signs at M25 traffic that may be present. You may suffer these signs anywhere on the road. If we all practice responsible driving, the streets will be more pleasant and safer for all of us.


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