What To Do When the Bicycles Take Over Our Roads. With the Marin Century and the Holstein Hundred attracting thousands of additional bike riders for 100-mile organized rides on West Marin's roads, it's a good time to consider how cars should deal with bicyclists - the considerate ones that ride single-file, and those that travel two or three abreast. George Clyde interviews Doug Henningsen of Marin Cyclists and offers some of his own techniques: "Car back!"