Mid-Ohio Sports Car Course is a road course auto racing facility located in Troy Township, Morrow County, Ohio, United States, just outside the village of Lexington. Mid-Ohio has also colloquially become a term for the entire north-central region of the state, from south of Sandusky to the north of Columbus.
The track opened as a 15-turn, 2.4 mile (3.86 km) road circuit run clockwise. The back portion of the track allows speeds approaching 180 mph (290 km/h). A separate starting line is located on the backstretch to allow for safer rolling starts. The regular start / finish line is located on the pit straight.
In 1990 the track underwent a refurbishment. A new retaining wall was built, the entire track was resurfaced, widened and concrete was paved in the apexes of the turns to prevent asphalt deterioration. In addition, a straightaway was paved through the chicane, allowing for two different track layouts, the original 2.4-mile (3.9 km) circuit and a new 13-turn, 2.258 mile (3.634 km) circuit. In 1990, the CART series began utilizing the 2.258-mile (3.634 km) layout.
There is grandstand seating for 10,000 spectators and three observation mounds alongside the track raise the capacity to over 75,000.