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Many current dirt tracks, as well as some asphalt tracks that used to be dirt, have developed a D shape. This is caused by having a wall along the grandstand side only and, as the track gets raced on and groomed, the back side away from the grandstand gets pushed out. This makes Turns 1 and 4 tighter than Turns 2 and 3. More steering is required for the tighter turns, and it is usually very difficult to accelerate off the corner in Turn 4 as opposed to exiting Turn 2.