lol, WTF, the cam car didn't 'merge' into anything, he remained in the left lane as he is entitled to do.
The red car was approaching from the same entry point as the cam car only in the right hand lane and tried to exit at the first exit, this is illegal and is sign posted as such.
Honestly, think of a time when you've approached a dual lane roundabout with the intention of exiting at the first exit and thought to yourself, ill do it from the right hand lane.
You wouldn't because you shouldn't.
Actually, I know of only 1 dual lane roundabout where you can in fact exit it at the first exit from the right hand lane without risk and they had to install a concrete divider as people were doing it so often resulting in accidents that it was the only option to prevent further accidents.
This roundabout is next to the old Holdens plant at Elizabeth at the intersection of Phillip highway and John Rice Avenue.
Back in the day when the Holdens carpark would empty onto John Rice avenue after day shift finished you'd get impatient flogs flying up the right hand lane to avoid the congestion and then want to make a left turn on to Philip Highway towards Elizabeth causing the type of accident in the
OP's video, so the RTA installed a concrete divider between the two lanes so the left lane can only turn left at the roundabout whilst the right hand lane can go straight ahead, or as some still do, bail left after entering the roundabout.
Im sure PB can attest to this.