Cyclists disembark Caltrain at Palo Alto Station on Bike To Work Day
The cyclists are smiling because they're happy they rode instead of sitting in traffic. It was a great day to bike. Traffic on Willow Road in Menlo Park, for example, was backed up from Newbridge Street all the way to Bayshore. Bicycling is fun!
THis photo was used to illustrate this article at San Francisco Bicycle Coalition.