If you are driving on this road in heavy traffic, you may not change lanes in order to...

A)leave the carriageway.
B)turn right.
C)overtake.Correct
When traffic is congested, vehicles will travel side by side, each in its own lane. Lane changes are only permitted to prepare to change direction, stop, park, leave the carriageway, or move to another lane on which there is an obligation to travel.
It is not considered overtaking when vehicles in one lane travel faster than those in another, when traffic is so dense that it occupies the full width of the carriageway.
It is not considered overtaking when vehicles in one lane travel faster than those in another, when traffic is so dense that it occupies the full width of the carriageway.