Not really. I make sure I ride in a safe and sensible manner, and use lights and reflectors on my bike to ensure I'm visible (I'm certainly safer than people riding brakeless fixed gear bikes) I have no desire to get run over while cycling, and have never been hit yet. I also wear gloves to give a bit of hand protection should I fall off (instinctively you put an arm out to break your fall.) Anyway, the discussion of the merit of helmets belongs in another thread if you can bear the pointless mud-throwing within.