Sorry for dull traffic thread but I'm a bit desperate.
Car A is waiting to turn right from a side road onto a main road (busy 4-lane type job, have to wait ages for a safe gap across multiple lanes of traffic)
Car B arrives on main road, wanting to turn right into the side road.
When there's a gap, who goes first?
AIBU to think that Car B should hang back and wait for Car A do their right turn first, as they were there first? Or does a car turning right from a main road have priority?
(I am sometimes A and sometimes B in this scenario, thanks to the nightmare junction at the end of my road - just want to know if there is a generally accepted approach)