Maybe the answer differs from state to state depending on the road rules, but based on the above situation: * Vehicle A has a green light to turn right onto the dual carriageway. * Vehicle B is turning left from a slip lane. The right-of-way seems obvious - because the slip lane is effectively an uncontrolled intersection, vehicle B must give way to the right (including vehicle A). This rule is summarised in the ACT Road Rules handbook as follows: To me there is one complication, however - In this case vehicle A is crossing multiple lanes to enter the left-hand lane. I was under the impression that vehicle A must first enter the right-hand lane to complete their turn, followed by an *indicated* lane change to the left. Similarly, when turning left from a single-lane into a multi-lane road, one should enter the far left lane. If this is true, then vehicle B in the above situation should be free to enter the left-hand lane (with due care). The only problem is that I can't seem to find any support for this theory in the Road Rules. Anyone care to help out?