The Indianapolis Motor Speedway (nicknamed The Brickyard) is an automobile racing circuit located in Speedway, Indiana, (an enclave suburb of Indianapolis) in the United States.
It is the home of the Indianapolis 500 and the Brickyard 400, and formerly the home of the United States Grand Prix. 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 second purpose-built, banked oval racing circuit after Brooklands and the first to be called a 'speedway'. It has a permanent seating capacity of 257,325. It is the highest-capacity sports venue in the world.
Considered relatively flat by American standards, the track is a 2.5-mile-long (4.0 km) rectangular oval with dimensions that have remained essentially unchanged since its construction. It has two 5⁄8-mile-long (1,000 m) straightaways, four geometrically identical 1⁄4-mile (400 m) turns, connected by two 1⁄8-mile (200 m) short straightaways, termed "short chutes", between turns 1 and 2, and between turns 3 and 4.
A modern, FIA Grade One infield road course was completed in 2000, incorporating part of the oval, including the main stretch and the southeast turn, measuring 2.605 miles (4.192 km). In 2008, and again in 2014, the road course layout was modified to accommodate motorcycle racing, as well as to improve competition.
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 the National Register of Historic Places in 1975 and designated a National Historic Landmark in 1987, it is the only such site to be affiliated with automotive racing history.