Mileage graph

When I got my current bike, I didn't attach a mileometer to it. Instead, I wrote a CGI script for my work computer, and every day either ticked a checkbox saying I had cycled in that day, or filled in how many miles non-commuting I had done, or both.

After seven and a half years, the resulting mileage graph looks at the first glance not to have too many features leaping out of it at you, but a closer look shows that actually quite a lot of my cycling habits are visible: