Explanation: You should normally use the left-hand lane on any dual carriageway, unless you're overtaking or turning right.
When overtaking on a dual carriageway, look for vehicles ahead that are turning right. They're likely to be slowing or stopped. You need to see them in good time so that you can take appropriate action.
Category: Band 1 road procedure
References: The official DVSA guide to driving: section 7, Highway code: rule 138