One of the most fun things about riding a bike is trying to figure out if a motorists that ran in to you was at fault or not and which road rules apply in that situation and which weird bicycle specific road rule might mean that you're actually at fault even though there was no action you could have taken to avoid it.
It's usually some weird combination of a bunch of different rules that are all vague.
This rider was hit by a car that overtook them in a roundabout and then hit them when exiting the roundabout and is asking who was at fault.
It's a multi-lane roundabout because there is a very faded painted bicycle lane. The rider is required to ride in the bicycle lane and thus is always in the left most lane and so is required to give-way to vehicles exiting the roundabout.
This is unclear and very impractical in this roundabout as the rider would need to give-way immediately upon entering the roundabout to any cars turning left behind them but those cars would also need to illegally overtake as it doesn't look like there is enough space for a motorist to give the 1m required when overtaking.
I would always ignore the bike lane at this roundabout and take the traffic lane to prevent motorists from illegally overtaking and to avoid the issue of vehicles exiting across me.
This is an example of how painted bike lanes are used to improve car throughput while making riding a bicycle more dangerous. There is no safe and legal way for a bike rider to approach this roundabout.
https://www.reddit.com/r/melbournecycling/comments/1qhqqdl/giving_way_in_a_roundabout/
