Those bicyclists! They're always doing this!
More like this
Anyone who’s lived in a big, dense city is familiar with the sight of bicycle messengers weaving their way in between metro buses and taxi cabs, down side streets and around packed crosswalks, pedaling at impressive speeds and often with remarkable agility.
The physics of why bicyclists hate stop signs - Hard Drive
This week is Bike to Work Week, and tomorrow is Bike to Work Day (the League of American Bicyclists lists events here).
It takes time to change social norms, so it'll probably take many, many years until it's as socially unacceptable to text or use a cell phone while driving as it is to start the engine without first buckling a seat belt.