When should you use the right-hand lane of a three-lane dual carriageway?

On a three-lane dual carriageway, the rules are very clear:

✅ Normal driving: You should keep to the left-hand lane whenever possible.
✅ Middle lane: Use it for overtaking slower traffic in the left-hand lane, or if traffic is congested.
✅ Right-hand lane: You should only use the right-hand lane when overtaking vehicles in the middle lane, or when instructed by signs/road markings (for example, if lanes are closed). Or when turning right

  • Proper Lane Use on a Three-Lane Dual Carriageway: The left lane is for normal driving, the middle lane for overtaking or congested traffic, and the right lane should only be used for overtaking or if instructed by signs.
  • Right-Hand Lane is for Overtaking Only: The right-hand lane is not for cruising; it is designated for overtaking vehicles in the middle lane, and drivers must return to the left lane once they have finished overtaking.
  • Rules for Using the Right-Hand Lane: Drivers should use the right-hand lane solely for overtaking slower traffic or when directed by road signs, and not for continuous driving, or for turning right
  • Key Advice for Learners and Drivers: Think of the right lane as a tool for safe overtaking; dip into it to complete overtaking and then return to the left lane promptly.
  • Theory Test Focus on Overtaking: The correct wording in the theory test emphasizes using the right lane only when overtaking, or turning right highlighting the importance of lane discipline.

Remember: The right-hand lane is not for cruising — it’s for overtaking or turning right. Once you’ve finished overtaking, you must move back to the left when it’s safe.

On the theory test, the correct wording usually comes up as:
“When you want to overtake slower traffic.”

When I’m teaching learners, I often use this line:
“Think of the right-hand lane as a tool, not a place to live. You dip into it, get the job done safely, and then return left as soon as you can.”

How is the rule about the right-hand lane emphasized in the driving theory test?

The theory test emphasizes that the right-hand lane should only be used when overtaking, often phrased as ‘When you want to overtake slower traffic,’ highlighting the importance of lane discipline.

What should I remember about the right-hand lane when driving?

Remember that the right-hand lane is a tool for safe overtaking; you dip into it to overtake and then promptly return to the left lane when it is safe to do so.

Can I use the right-hand lane for continuous driving?

No, the right-hand lane is not for continuous driving; it is intended solely for overtaking, and you must return to the left lane once overtaking is complete.

What is the proper lane discipline on a three-lane dual carriageway?

The proper lane discipline is to keep to the left lane for normal driving, use the middle lane for overtaking or congested traffic, and reserve the right lane strictly for overtaking or when instructed by signs.

When should you use the right-hand lane of a three-lane dual carriageway?

You should use the right-hand lane only when overtaking slower traffic in the middle lane or when directed by road signs or markings, not for cruising. The other time you may use it is when turning right