When I was a kid & use to go to the races at the brick track in salem, Ind. w/my uncle. All of the sharp curves had squiggly lines at the start & end of all curves. My uncle would race everyone that was headed that way out of Evansville in his hopped up 53 Mercury. I always remembered those lines in the curves because we were going so fast that they seemed like they were straight. That was about 1948 to 1955.