The Indianapolis Motor Speedway, located in Speedway, Indiana, (an enclave suburb of Indianapolis) in the United States, is the home of the Indianapolis 500 and the Brickyard 400.It is located on the corner of 16th Street and Georgetown Road, approximately six miles (10 km) west of Downtown Indianapolis.
Constructed in 1909, it is the original speedway, the first racing facility so named. It has a permanent seating capacity estimated at 257,325, with infield seating raising capacity to an approximate 400,000. It is thehighest-capacity sports venue in the world.
Considered relatively flat by American standards, the track is a two-and-a-half mile, nearly rectangular oval with dimensions that have remained essentially unchanged since its inception: four 1⁄4-mile (400 m) turns, two 5⁄8-mile-long (1,000 m) straightaways between the fourth and first turns and the second and third turns, and two 1⁄8-mile (200 m) short straightaways, termed "short chutes", between the first and second, and third and fourth turns.
A modern infield road course was constructed between 1998 and 2000, incorporating the western and southern portions of the oval (including the southwest turn) to create a 2.605-mile (4.192 km) track. In 2008, the road course was modified to replace the southwest turn with an additional infield section, for motorcycle use, resulting in a 2.621-mile (4.218 km) course. Altogether, the current grounds have expanded from an original 320 acres (1.3 km2) on which the speedway was first built to cover an area of over 559 acres (2.3 km2). Placed on theNational Register of Historic Places in 1975 and designated a National Historic Landmark in 1987, it is the only such landmark to be affiliated with automotive racing history.
In addition to the Indianapolis 500, the speedway also hosts NASCAR's Brickyard 400. From 2000 to 2007, the speedway also hosted the United States Grand Prix for Formula One. The inaugural USGP race drew an estimated 400,000 spectators, setting a Formula One attendance record. In 2008, the speedway added theIndianapolis motorcycle Grand Prix, a Grand Prix motorcycle racing event.