Michelin's Challenge Bibendum celebrated its sixth Birthday in October. The Challenge is billed as a rolling roadshow for environmentally positive vehicles aimed at bringing industry and policy makers together, while spreading the word publicly as well. The event was originally staged to celebrate the Michelin Mascot, Bibendum's, 100th birthday in 1998 and has now become a major fixture on the automotive calendar. This year, it was held near the city of Sonoma in the wine-growing county of the same name, north of San Francisco. As usual, it attracted a large entry drawn from mainstream manufacturers, suppliers and independents too. Jesse Crosse was there.