Martinsville Speedway is an International Speedway Corporation]-owned NASCAR stock car racing track located in Ridgeway, Virginia]. At 0.526 miles in length, it is the shortest track in the NASCAR Sprint Cup Series. The track was also one of the first paved "superspeedways" in NASCAR, being built in 1947 by H. Clay Earles. The track is often referred to as paper clip-shaped and is banked only 12° in the turns. The combination of long straightaways and flat, narrow turns makes hard braking going into turns and smooth acceleration exiting turns a must.