19. THE GOLF COURSE WENT IN IN 1929.
Initially the 27-hole course had nine holes inside the track.
20. THE STARTING FLAG WAS RED UNTIL 1930.
A green flag replaced a red one to start the 38 drivers on the 500 mile journey. Today, a red flag means a race has been stopped or suspended due to unsafe conditions.
21. FLAGS WERE USED TO SIGNAL CAUTION ALL AROUND THE TRACK UNTIL 1935.
That's when lights went in to signal drivers, yellow and green side-by-side at various locations around the oval.
22. THE 3.2 MILLION BRICKS THAT ORIGINALLY COVERED IMS WERE PAVED OVER GRADUALLY.
The Speedway's website says, "Asphalt gradually was added to various sections of the brick surface, with patches added to rougher sections of the turns in 1936 and all turns being completely paved with asphalt except for the middle portion of the front straightaway."
Brick Me. --RoadDog