In reply to supafly:
1. Yes
2. I've been doing it for... erm... 38 years if you count school too! At the moment, I cycle 4.5 miles to work, down and up hill, then 4.5 miles back. In my experience, you can often find much quieter ways of cycling than you can driving, and I use a mix of quiet roads, cycle lanes, cut throughs and footpaths. I have no qualms about cycling slowly and carefully on a footpath if it saves me having to cycle around a manic 3 lane roundabout, where I am likely to get killed, and always give way to pedestrians.
3. Yes. Several! One when I was about 12, when I was ill and didn't look properly before pulling out into a road. I got hit by a motorbike and knocked out, so had stitches in my head (no helmets in those days), but otherwise was fine.
I cycled with a carrier bag on my handlebars when I was 17, looked behind me and it went into the front wheel. I took off half my face (no helmet), knocked myself out and had stitches in my chin and eyebrow, but then was fine, with no scarring.
I cycled towards another cyclist on a path through a university in my 20s, and we both went to the left, then both to the right, then both to the left, then headbutted one another (no helmet) and this time, I didn't lose conciousness, but I did have concussion.
In my 30s I cycled towards a roundabout, looked a driver right in the eye, so I thought he had seen me, then he pulled out and ran me over, knocking my head onto the road (no helmet) but I didn't get knocked out, but had some steristrips from the doctor to stick me together.
I now wear a helmet all the time!
I have also had a variety of smaller things, falling off on black ice, having someone pull out from a side road, kids running across the road in front of me etc, which haven't resulted in any serious injury. I broke my hand coming off my mountain bike in some woods once.
I LOVE cycling to work! It is one of my criteria for working somewhere! It is a basic level of exercise in your life, gets you outdoors every day and is very energising. You get to see the autumn leaves, squirrels, blossom, people walking their dogs etc.