I live in Kitchener right now and experience roundabouts regularly here. On the whole, I really like them. That said, there are some problems. Primarily, people seem to forget how to use signal lights in a roundabout. I've noticed improvements with respect to this, but if at the very least people would signal their exit, they would be far more efficient and accidents would likely be even more reduced. The other problem is that on multi-lane roundabouts, people seem to get excited and think that it is a good opportunity to overtake other drivers. Don't do this! This is particularly problematic on Ira Needles Blvd. The road is one lane in each direction for most of its length, but the roundabouts are two lanes. Impatient drivers try to use the opportunity to pass, which is generally not successful and leads to people travelling far too fast through the roundabouts on that road. Until Ira Needles is eventually four-laned, it might be a good idea to put speed bumps at the entrance to the roundabouts to force people to slow down.