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Matthew Hopfner, 10, of Concord, speeds down Main Street in Clayton, in a soapbox derby car during the 10th annual Great Labor Day Derby & Car Show on Main Street in downtown Clayton, Calif., on Saturday, Aug. 31, 2013. The race was sponsored by The Clayton Community Church. (Dan Rosenstrauch/Bay Area News Group)

DAN ROSENSTRAUCH/Staff

In the driver's seat

Matthew Hopfner, 10, of Concord, and Gabe Lauricella, 8, of Clayton, race down Clayton's Main Street in the 10th annual Great Labor Day Derby & Car Show. Colleen Tortorice, of Concord, waves the checkered flag at the finish line, signaling the winning racer on the course in downtown Clayton. The soapbox derby and car show, sponsored by the Clayton Community Church, was held Aug. 31. Some 250-300 kids ages 7-14 participated in the soapbox derby race, including a crowd of boys and girls in the 9-10 age group, who lined up for their turn to steer their car down Main Street.