Near 16th and Georgetown beyond turn 1.
2016 update - with the recent redesign of this area - a roundabout that disconnects Georgetown with 16th Street and a larger, more open walkway entrance to the grounds - this sign is no longer there. However, a large speedway logo sign, similar to what is seen on this sign, is on display in the middle of the new roundabout.
Indianapolis Motor Speedway sign
By milwhcky @ 2008-09-20 15:23:44