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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 grandstands gets pushed out. This makes Turns 1 and 4 tighter than Turns 2 and 3. More steering is required for the tighter turns and in Turn 4 it is usually very difficult to get traction under power as opposed to exiting Turn 2.