Over the last three days I have had three incidents at three seperate roundabouts. Each incident has been avoided easily but ended up with me hitting the brakes and horn at the same time. All of the occasions I was going straight through the roundabouts in the correct lane. Twice has been on the bike at roundabout that have had moderate traffic, because of this my approach speed has been rather sedate. On both occasions I believe the motorists saw me but went anyway. The other occasion I was driving a borrowed car and I was driving very carefully, a 4wd decided even though I was quarter way through the roundabouts that it should have right of way. Is it just me or is the hot weather bringing out the worst in Melbourne drivers?