Many current dirt tracks, as well as some asphalt tracks that used to bedirt, have developed a "D" shape. This is caused by having a wall alongthe grandstand side only. As the track gets raced on and groomed, theback side away from the grandstands gets pushed out. This makes Turns 1and 4 tighter than Turns 2 and 3. More steering is required for thetighter turns and in Turn 4 it is usually very difficult to get tractionunder power, as opposed to exiting Turn 2.