How to drive safely on smart motorways

Many UK motorways use technology to monitor and manage the flow of traffic. We explain how to drive safely on a smart motorway.

How to drive on a smart motorway

Rishi Sunak has halted expansion of the UK’s smart motorway network. The prime minister cited a lack of public confidence in smart motorways, which have been blamed for a number of accidents and road deaths, as one reason for his decision.

Smart motorways use technology to control the flow of traffic, reduce congestion and improve journey times. There are still 375 miles of these roads in the UK, so understanding how they work is important – both for your own safety and that of others.

These are the three types of smart motorway you may encounter:

  • Dynamic hard shoulder: where the hard shoulder is temporarily opened up to traffic
  • All-lane running: where the full width of the road is usable with emergency refuge areas alongside
  • Controlled motorway: with three or more lanes, a hard shoulder and variable speed limits

Read our separate article to discover more about the pros and cons of smart motorways.

Tips for safe driving on smart motorways

Red X closed lanes smart motorway fines

National Highways, which manages the motorway and A-road network in England, has the following advice for motorists driving on a smart motorway:

  • Never drive in a lane closed by a red ‘X’. Not only is it illegal, you will endanger the lives of other motorists and anyone who might be working in the closed lane.
  • Keep to the speed limits shown on the signs. National Highways uses sensors and cameras to monitor traffic volumes, with limits set accordingly.
  • A hard shoulder is always identified by a solid white unbroken line. If there’s no speed limit displayed above it or a red ‘X’ is displayed, do not use it except in emergency.
  • A broken white line indicates a normal running lane.
  • If the hard shoulder is being used as an extra lane, use the designated emergency areas for emergencies.
  • If your vehicle experiences difficulties, exit the motorway immediately.
  • If you break down, put your hazard lights on.
  • Most breakdowns are preventable. Keep your car maintained, check your tyres and ensure you have enough fuel for your journey.

In an emergency or breakdown

Using the hazard lights

If you are unable to exit the motorway, follow these steps:

  1. Use an emergency area. These are marked with blue signs with an orange SOS telephone symbol.
  2. If you can leave your vehicle safely, contact National Highways using an emergency telephone at the roadside. Alternatively, call 0300 123 5000 from your mobile phone.
  3. If you can’t get to an emergency area, move to the hard shoulder (where available) or as close to the nearside of the road as possible.
  4. Consider exiting the vehicle via the nearside door and waiting behind the safety barrier.
  5. Switch on your hazard lights and side lights. Do not use a warning triangle.
  6. Contact your breakdown provider, such as the AA or RAC.

What does the red ‘X’ mean?

A red ‘X’ means you must stay out of a lane that is closed to traffic. It might be displayed on an overhead gantry or on large signs next to the motorway.

It’s illegal to drive in a lane closed by a red ‘X’ sign. You could receive a fixed penalty of up to £100 and three points on your driving licence. More severe penalties and a court appearance could follow in some cases.

Variable speed limits

Variable speed limit sign

National Highways might impose a variable speed limit at busy times, but these can also be automatically triggered by sensors that monitor traffic flow.

The speed limit is displayed inside a red circle and is legally enforceable. If no limit is displayed, the national speed limit of 70mph on a motorway applies.

Speed cameras are in operation on the smart motorway network and the police are responsible for enforcing speeding offences.

Always keep left

As on any motorway, you should always drive in the left-hand lane when the road ahead is clear.

You must not drive on the hard shoulder except in an emergency, or unless instructed to by the police, National Highways or road signs.

ALSO READ:

Which lane should you use on an unmarked roundabout?

Speed limits, roads and the law: what you need to know

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Motoring Research team
Motoring Research team
News, reviews, advice and features from the award-winning Motoring Resarch editorial team.

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