Friday I went shopping down south and had two roundabout incidents (no contact, just close calls)
The first one I engaged in the roundabout and put my arm out it signal to the car arriving fast behind me that I was continuing around the roundabout to the next exit. He tried passing me any way and only succeed because I braked really hard when he cut me off. I was doing about 20-25 kph and... not wearing helmet in an area where I should have been (just outside town limit).
Second I came off the bypass down to the roundabout that turns back to the French border. There was a woman in a Mercedes engaged so I started slowing in order to slip in behind her as she passed. She saw the speed at which I was arriving (about 35-38kph) and braked in the roundabout while screaming Spanish words a lady does not pronounce. I was wearing my helmet.
Moral of the story: drivers, either male or female, are bad judges of your speed when you are on a bike (could well have been a push bike in both cases) and will act unpredictably accordingly. As flecc said you have to think for yourself and for the others around you, they aren't capable of thought...