I second that. I started commuting myself four months ago when I got my current job in a new city. After just two weeks I fell down from an elevated cycling pat

I second that. I started commuting myself four months ago when I got my current job in a new city. After just two weeks I fell down from an elevated cycling path, and hit my head (w/ helmet) on the tarmac. I had to replace my helmet, but I walked away with just a small scratch on a hand. Also, check regularly the tightness of your wheel spokes, and replace a wobbly wheel if you can.