The Numbers say it all...
Felix Salmon over at Reuters has a fantastic post about how the efforts of Janette Sadik-Khan (or better known as "JSK") on making NYC more bicycle friendly. I'll just post the picture below:
But Salmon puts it well
The lesson of this chart, then, is that if you build bike lanes, cyclists will appear to fill them. That’s fantastic news, since cities with lots of cyclists are always the most pleasant cities to live and work in — even for people who don’t bike themselves. New York City has a long way to go before it can be considered genuinely bike-friendly.
On the subject of Bicycle advocacy, The Silicon Valley Bicycle Coalition is working with local cities to make them bicycle friendly. Consider the gift of membership this year if you are in the Bay Area.