Totally! Most drivers who speed are probably much safer than those that drive too slowly.

Tonight I had a very near miss, and again it was on a roundabout! I was in the outside lane, following a van, going around a roundabout, indicating right as I needed the third exit. When a car going really fast suddenly shot straight out of the first exit between the van and my car into the outside lane of the roundabout. He must have squeezed between us with inches to spare. Mad! He got a blast from my horn and a flashing headlights in his rear view mirror but I doubt that did much.