The speed limit of ten miles (16 km) an hour had existed in Valley Junction since 1911 for all automobiles. But in 1915 an Englishman named Jack Prince built a one-mile (1.6 km) oval race track, designed to let race cars break that speed limit ten times over. The wooden track was made of of 2x4's laid on edge. It was one of 24 such tracks nationwide; with seating for over 10,000 people. On August 7, 1915, the eyes of the auto world were on Valley Junction in anticipation of the fastest auto race in history. Ralph DePalma, winner of the Indianapolis 500 that year, was one of at least a dozen drivers vying for the $10,000 purse. Before a crowd of 7,000 people, a tire blew, lunging Joe Cooper's car over the rail. Cooper was killed and his mechanic was injured. Later while rounding a curb, a wheel of Billy Chandler's Duesenberg failed, cartwheeling the car into the infield and fatally injuring his mechanic, Maurice Keeler. Chandler was seriously injured. Smiling Ralph Mulford won the race with DePalma a close 2nd. This baptism by blood left a bad taste in the mouth of the locals, and the track was closed two years later. The wood was salvaged and then used to construct buildings in Valley Junction.