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Speed Limits

Chapter 6

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Driving Speed Limits

Increased speed increases the risk of crashing and the severity of the crash. Many fatal crashes and single vehicle crashes, e.g. running off the road, are in some way caused by speed. 

Knowing your road speed limit helps you to become a better driver and forms a key part of driving safely.

In this lesson we will go through the national speed limits, different driving speed limits & important rules.

What is a speed limit?

50 mph speed limit sign.50 mph speed limit sign

The driving speed limit is the maximum speed a driver is allowed to drive at, it does not however mean that it is always safe to drive at the speed limit, irrespective of conditions. Driving at speeds too fast for the road and traffic conditions is dangerous. 

It is advisable to stick to lower speeds when you are driving off-road or on uneven surfaces. 

lesson imageReduce your speed on e.g. dirt roads

When to Reduce Your Speed 

As a driver, you must always determine if you are driving at a safe speed. There are 4 general times when you should always reduce your speed:

  • When the road layout or condition presents hazards, such as bends
  • When sharing the road with pedestrians, cyclists and horse riders, particularly children, and motorcyclists
  • When weather conditions make it safer to do so
  • When driving at night as it is more difficult to see other road users

What Are the National Speed Limits?

The national speed limit on roads in built-up areas is 30 mph. This speed limit also applies to all roads with street lighting, unless signs show otherwise. 

The national speed limit on roads outside of built-up areas depend on what kind of road it is, different speed limits apply for single carriageway and dual carriageway or motorways.

The national speed limits are as follows

  • In built-up areas: 30 mph
  • On single carriageway: 60 mph
  • On dual carriageway or motorway: 70 mph

lesson imageThis sign indicates that the national speed limit applies

Other Speed Limits & Rules

School Speed Limits

Children are unpredictable, may be unaware of road rules and often fail to recognize dangerous situations on the road. Therefore, many local authorities have imposed lower speed limits (often 20 mph) near schools to better protect children from fast travelling vehicles. 

Advisory Speed Limits

30 MPH Advisory Speed Limit Road SignThis sign indicates an advisory speed limit of 30 mph

An advisory speed limit will tell you the maximum speed that is safe to drive in good conditions. You are recommended to reduce your speed temporarily and display caution to get past safely. These speed limits are generally placed before bends, curves and crests.

Minimum Speed Limits

30 MPH Minimum speed limit signThis sign indicates a minimum speed limit of 30 mph 

You must not obstruct vehicles behind you by driving unreasonably slow (e.g. 10 mph on a 60 mph road) unless conditions require you to. On rare occasions, there are even signed minimum speed limits - these signs use the same layout as maximum speed limit signs, but have a blue background.

Variable Message Signs

lesson imageVariable message sign indicating a lane closure

These are electronic signs that are placed overhead of, or next to, some roads, and provide early warnings and messages in order to create a safe and efficient traffic flow. They alert road users to changes in traffic conditions e.g. crashes, road works, congestion and road closures.

Shared spaces

Shared spaces are meant to protect pedestrians by encouraging lower speeds and removing any implied priority for drivers on the road i.e. drivers should be prepared to give way to pedestrians within the shared space. 

Driving shared spaces allows motor vehicles and pedestrians to easily flow with less restrictions using features like kerbs, road surface markings and less traffic signs.