Our friends at Grist tell us that it is Bike to Work Day, which it is in San Francisco. But it is on May 16 in New York, and May 26 in Toronto. There apparently is no definitive Bike to Work Day in North America.
However there is a definitive guide to building better bike infrastructure, the just-released second edition of the Urban Bikeway Design Guide from the National Association of City Transportation Officials (NACTO), published by Island Press. (Mike reviewed the first edition here)
The treatments outlined in this updated Guide are based on real-life experience in the world's most bicycle friendly cities and have been selected because of their utility in helping cities meet their goals related to bicycle transportation. Praised by Former Transportation Secretary Ray LaHood as an “extraordinary piece of work,” the Guide is an indispensable tool every planner must have for their daily transportation design work.
The first version was in a loose-leaf binder format with lots of fold-out pages that frankly was a bit of a pain; this second edition has larger pages and is bound, making it far easier to use.