The lane on the right may be used for overtaking or turning right. After overtaking, you should move back to the left lane when it is safe to do so. When you are changing lanes for overtaking or turning right, you should first use your mirrors and if necessary take a quick sideways glance to make sure you will not force other road users to change course or speed. When it is safe to do so, signal to indicate your intentions to other road users and when clear, move over.
If you are overtaking, watch for clues that traffic ahead of you is slowing down to turn right.