A. On a two-lane dual carriageway, use the right hand lane only for overtaking or turning right
B. On a three-lane dual carriageway, stay n he left-hand lane. If there are slower vehicles than you in that lane, Use the middle lane to overtake them but return to the left hand lane when it is clear
C. the right hand lane is for overtaking (of turning right); if you see it for overtaking, move back into the middle lane and then into the left-hand lane as soon as it is safe to do so
D. All of the above