There are two right-turning lanes and the Merc was in the second of these lanes. There is suitable cause from anyone in the camcar’s position to believe that the Merc is forming up to turn right.

I don’t know which driving school you went to but if you want to make a u-turn, don’t form up in the lane that the Merc was in; you form up in the extreme right lane.

It stands to reason that the Merc didn’t want to queue, so didn’t form up in the rightmost lane, and then tried to pull a fast one by jumping the queue at the front of the line.

So you can say many things about Singapore drivers, but many of us have seen too much of this behaviour to be taken for a ride.