Higher-speed roads
Dual carriageways
Lesson breakdown
Sub-skills
Lesson 1
Joining from a slip road
The slip road exists to remove the need for anyone to give way to you - build to carriageway speed before it ends, and the merge becomes a formality rather than a negotiation.
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Lesson 2
Overtaking on a dual carriageway
Plan overtakes early, move out decisively when safe, and return to the left lane without cutting in.
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Lesson 3
Exiting a dual carriageway using a slip road
Plan the exit early, move into the correct lane in good time, and use the slip road to reduce speed safely after leaving the main carriageway.
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Lesson 4
Turning right using a central reservation gap
A central reservation gap isn't one crossing, it's two - each carriageway is a separate decision, and the reservation itself only works if your car actually fits inside it.
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Lesson 5
Passing parked cars on a dual carriageway
A parked car on a dual carriageway isn't a hazard to react to at the last moment - reading it early, especially just after pulling away from a stop, is what turns the lane change into a normal manoeuvre rather than a rushed one.
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Practical test
Why it matters
Dual carriageways test higher-speed judgement, mirror and blind-spot use, lane discipline and forward planning. Poor lane discipline or a late, forced lane change can be recorded as a fault, and more seriously if it makes another driver react.
What to look out for
Keep left, right lane to pass
On a two-lane dual carriageway your normal position is the left lane. The right lane is for overtaking or turning right, not for cruising.
The slip road does the work
Joining and leaving both happen on the slip road - build speed on it when joining, lose speed on it when leaving, so the main carriageway stays smooth.
Key steps
- 1 Join by building speed on the slip road to match the traffic already on the carriageway, checking mirrors and your blind spot before you merge - you give way to them, not the other way round.
- 2 Keep to the left-hand lane, using the right lane only to overtake or turn right, and return left once you've finished.
- 3 Before any lane change, check your mirrors and take a quick sideways glance so you don't make anyone behind change speed or course.
- 4 Plan your exit early from the direction signs and countdown markers, and move into the left lane in good time rather than changing late.
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Common mistakes
Joining too slowly
Use the slip road to reach carriageway speed so you fit into a gap, rather than making faster traffic slow for you.
Sitting in the right lane
The right lane is for overtaking or turning right - return left as soon as it's safe once you've passed.
Changing lanes late
Read the signs and countdown markers early so your lane is settled before the exit, not snatched at the last moment.
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Highway Code
This lesson is a revision aid, not a replacement for The Highway Code.
Rule 137
On a two-lane dual carriageway, stay in the left-hand lane and use the right-hand lane only for overtaking or turning right, returning to the left when you've finished.
Read on GOV.UKRule 133
Before changing lane, use your mirrors and if necessary take a quick sideways glance, so you don't force another road user to change speed or course.
Read on GOV.UK