Well, I'd kind of hope it is rare, because there would be even more deaths - but the investigation into the spate of deaths in London showed that primarily, that was what was happening.
Where I live my main problem is that the cycle lane is to the left of the bus lane, which itself is to the left of the lane for other vehicles. Drivers seem to check for buses when turning left, but not bikes. The traffic at commute time is barely managing walking pace, whereas two lanes away I'm riding at about 20MPH in my own lane. Lots of people fail to indicate left so I have to presume that every car is about to ride in front of me.