Arts & Entertainment Photos: SFMOMA's Soapbox Derby Makes Glorious Return to McLaren Park for First Time Since 1978 Thousands of onlookers gathered along John F. Shelley drive Sunday afternoon to watch a parade of soapbox derby cars descend down the steep road. And while most of the rickety race cars crossed the finish line without much of a hiccup, the day's race included a few epic wipeouts.