The Indianapolis Motor Speedway is an automobile racing facility in Indianapolis, Ind., that first hosted racing in 1909. IMS was the second purpose-built, banked oval racing circuit after Brooklands and the first to be called a "speedway."

The initial track in 1909 consisted of graded and packed soil covered by 2 inches of gravel, then 2 inches of limestone covered with taroid (a solution of tar and oil), then 1–2 inches (3–5 cm) of crushed stone chips  also drenched with taroid, with a final topping of crushed stone. The surface left the race cars and . . .

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