Probably the most widely attended race is the Brickyard 400, held at Indianapolis Motor Speedway.
NASCAR also holds Nationwide and Camping World Truck events at Lucas Oil Raceway at Indianapolis (formerly known as Indianapolis Raceway Park), but these events aren't as prestigious as The Brickyard.
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The Indianapolis Motor Speedway is the site of a number of auto races, most notably the Indy 500, which is held each year on Memorial Day Weekend. The Speedway hosts the 94th Indy 500 in 2010.