Remember kids... always wear a helmet. (The almighty bikeradar helmet thread)

You should probably try using your eyes. I find that helps immensely.

If you're having to have a window open when navigating a roundabout in a car, then seriously it sounds like you are doing it wrong.

Given the state of some roads with potholes/craters added to the right turn I need to make up ahead; I can't afford to take my eyes off the road in front of but I'm not 100% sure about how far behind that vehicle that pulled out from that side road is behind me...