wafflycat said:
The best thing a cyclist can do, IMO, is learn to cycle safely and assertively (not aggressively) to minimise risk as much as reasonably possible in the first place. Indeed, I'd place wearing gloves as being more important a bit of safety kit than wearing a lid.
For me the best response to the opening question. Safe cycling, in every sense, is made up of a multitude of techniques combined with being sure your cycle is fit for the road and having, if you wish, the right equipment. IMO wearing a helmet is part of improving my personal safety on the cycle - I'm only worried about my personal safety so I chose to wear one. I would prefer not to but it's a small sacrifice.
Last August I had my one and only big crash. Fortunately I had time to take the decision to broadside into the car which crossed my path. I reckon I hit him at 15mph and the only real damage was a broken hand. If I'd had less time to react I would have been over the top doing at least 22mph if not more. If I'm going over a car roof at that speed I want all the help I can get.
Take time to find a quality, well ventilated helemt that feels comfortable and you will soon forget it's on your head.
My lad races karts and I'd like to know if one can buy Snell standard cycle helmets. This being the toughest category of motorsport helmet.