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I have to say that roundabouts are one of my pet hates. Roundabouts are designed with cars and trucks in mind, making an intersection more dangerous for cyclists and pedestrians.
Where I can I choose a route which avoids roundabouts. One thing I love about using a bike to travel around is that I can use side streets and short cuts. It's often safer, more scenic and faster to use quiet side streets and paths. Travelling to work cycling I would use completely different roads to if I was driving in a car and taking the most obvious route along main roads, which nowadays are often congested as well.

I do use roundabouts, and some are hard to avoid. One example is the 'pinch point' on Macarthur St at the top of Drummond St near the cemetery. As I'm coming up to the roundabout I look for a gap in the cars, indicate with my right hand that I'm going to merge, then take the centre of the lane and keep it until I'm through the roundabout.
Bicycle Victoria have a page on the rules for going through roundabouts here: http://www.bv.com.au/general/bikes-and-riding/11136/
It is possible to design a roundabout to make it safer for bikes. The Ballarat Council's Bike Strategy says that "roundabouts should be of a ‘continental design’ encouraging cyclists and motorists to merge before the circulatory carriageway of the roundabout". Instead, most of Ballarat's roundabouts are "designed with flared entries (widening of approach lane) and wide circulatory carriageways that encourage higher traffic speeds and reduce the presence of cyclists. Where entries are wide, motorists and cyclists are not encouraged to merge before entering a roundabout and as a result are not appropriately acknowledged by drivers."
So there are a number of things that can be done to make roundabouts safer. The ‘continental design’ mentioned above, off-road paths for cyclists to leave the road to get past the intersection, pedestrian operated signal crossings or change the intersection to traffic signals.
Some roundabouts, like the two lane one on Creswick Road and Webster St, I find too difficult most times to ride through. In this case I take advantage of one of the benefits of being a cyclist, and I become a pedestrian to get through the intersection. But always remember that a bike is a vehicle on the road and by law we are allowed to take the lane.
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By taking the lane cyclists are more visible to cars, and cars can't push past you. One problem with roundabouts is cars failing to give way because they are coming up to the roundabout too fast and don't look properly. Being as visible as possible is my preference.
An example of an intersection I think is confusing for both cyclists and cars is the Pleasant St roundabout at Eyre St. Travelling south from Sturt St there is a clear bike lane that goes right up to the roundabout, then just stops and is actually blocked by kerb. If you ride to the end of the bike lane you are left in the situation where you have to push into a long line, generally, of already stopped cars who you have just passed. In this case, in order to merge while the traffic is still moving and starting to come to a stop, you have to join the cars quite a way before the bike lane ends at the roundabout.
Bicycle Victoria have some more suggestions for how existing roundabouts can be made safer for cyclists, and comments on bike lanes around roundabouts, under "Retrofitting a roundabout on a bike route" here: http://www.bv.com.au/general/bike-futures/42527/
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