Following the 1961 race, the remaining part of the mainstretch was paved over, and the entire track was now covered in asphalt. One yard of bricks was left exposed at the start/finish line. The vast majority of the original 3.2 million bricks remain in place, several inches beneath multiple layers of asphalt. Some bricks have been unearthed from the track over the years, namely in the locations where the infield access tunnels have been constructed. Subsequent repavings of the track in 1976, 1988, 1995, and 2004, have preserved the bricks in place underneath. However, the yard of bricks exposed at the start/finish line has been dug up in those instances by milling operations. Different bricks - ostensibly bricks that were dug up at one point from other parts of the track - were cleanly re-laid in that place, both for safety and aesthetic reasons.