When joining the flow of traffic, you must...
A)do so as quickly as possible.
B)avoid doing so without the sidelights on.
C)yield to other vehicles.Correct
Before joining the flow of traffic, the driver must observe the traffic to ensure that the distance, position, trajectory and speed of approaching vehicles are such that they allow the manoeuvre to be carried out safely. Otherwise, the driver must abandon and postpone the manoeuvre to a suitable moment, as they are required to yield.