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This figure shows four separate images.
The first image shows a computer-generated illustration of a post, colored in red and broken into a multitude of squares. The front end of the impact vehicle is shown striking the left-hand side of the post, though no damage has occurred as of yet to the post.
The second image shows the computer generated illustration of the post, with the top half of the post leaning ever so slightly to the right hand side, the impact vehicle still in contact with the left-hand side of the structure. The base of the post shows some damage, as the left-left hand side appears to be disintegrating, with a handful of squares now missing for a small part of the structure.
The third image shows the computer generated illustration of the post, with the top half of the post leaning further to the right hand side. A gap has formed near the mid-point of the entire post. The disintegrating blocks at the base of the post have increased, working their way up the left-hand side of the post a short distance from the gap that has now formed.
The fourth image shows the computer generated illustration of the post, with the top half of the post leaning considerably to the right hand side, the gap now open severely. The disintegrating blocks at the base of the post have increased severely, now present up to the point in which the gap has formed, and spreading across the majority of the lower half face of the structure.
FHWA-HRT-05-096
