I was reversing out from a 45'' angle parking space onto the main street with a 40kmph limit,I was backing out slowly while using my mirrors and side window to check for cars,There was a roundabout 20 to 30 meters away and there were no cars present when I started to back out ,I had nearly completed backing out when a car came speeding through the roundabout.I braked thinking they would stop or go around me but they smashed into the back of me.