Long Description: Figure 9. Off-tracking was Calculated by Taking the Difference in the Path Followed by the First and Final Axles - Line Graph

Figure 9 consists of a line graph and a picture. The picture is of a semi driving on the center line in a curve. The line graph is expressing the line position in inches and the station in feet. The blue curve represents axle 1 (steer axle) path of the steer axle centerline. The red curve, which is outside of the blue curve, is the path of the fifth axle. The distance (4 to 15 inches in this chart) between these two curves, indicated by the arrow in the figure, is the off-tracking. (Figure 9 line graph)

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