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Driving on Dual Carriageways: Speed, Lane Discipline, and Joining

Dual carriageway sections appear on many test routes. Learn correct speed, lane use, and how to join and leave safely.

7 min read

If the test centre is near a dual carriageway, your route will almost certainly include one. The national speed limit on a dual carriageway is 70mph — the examiner will expect you to drive up to that speed where safe and appropriate. Many learners drive too slowly here and are penalised.

The Full Guide

The slip road is your acceleration lane. Build up to a speed matching the flow of traffic before you merge — don't enter at 40mph into 70mph traffic. Indicate right. Check your right mirror and blind spot. Find a safe gap in the left lane and merge smoothly. The left lane has priority — you are merging into them, not them giving way to you.

Common Faults

  • Joining at too low a speed — not accelerating on the slip road
  • Driving at 40–50mph when clear — failing to match traffic flow
  • Middle lane hogging — staying in lane 2 when lane 1 is clear
  • Not checking right blind spot before moving right to overtake
  • Not moving back into the left lane after overtaking
  • Missing the exit — overshooting the countdown markers

What the Examiner Looks For

  • Confident joining speed — close to 70mph before merge
  • Driving at the national speed limit where conditions allow
  • Left lane use as the default — right lane only for overtaking
  • Correct observations before any lane change
  • Timely exit — not last-second lane changes

Quick Tips

  • 1Trust your speed — the car is fine at 70mph if it's been serviced
  • 2Look well ahead on dual carriageways — much further than in towns
  • 3Always return left after overtaking — don't sit in the overtaking lane
  • 4Speed awareness resets when you leave — consciously check the new limit

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