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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 graded, the back side away from the grandstands gets pushed out. This makes the radii of Turns 1 and 4 smaller and tighter than Turns 2 and 3. More steering is required for the tighter turns and in Turn 4, it's usually very difficult to get traction under power as opposed to exiting Turn 2.