Second only to Daytona in size and popularity, the immense speedway attracts visitors from all over the country and is the home of the state's largest single-day, paid-admission sporting events. Opened almost 40 years ago, the Michigan International Speedway has 18 degree banking and 73-foot wide sweeping turns and provides drivers with three and four grooves to run around the two-mile speedway. The center grandstand seats 55,000, have quadrupled in size since it was first built and is now the largest sporting arena in Michigan.