Highway Code 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.

Section: General rules, techniques and advice for all drivers and riders (rules 103 to 158)
Subsection: Multi-lane carriageways (rules 133 to 143)

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Highway Code Rule 138

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