A dual carriageway is a road which has a central reservation to separate the carriageways.
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A dual carriageway is a road which has a central reservation to separate the carriageways.
Rule 137
On a two-lane dual carriageway you should stay in the left-hand lane. Use the right-hand lane for overtaking or turning right. After overtaking, move back to the left-hand lane when it is safe to do so.
Rule 138
On a three-lane dual carriageway, you may use the middle lane or the right-hand lane to overtake but return to the middle and then the left-hand lane when it is safe.
Read more rules about multi-lane carriageways
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