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The first image in this figure shows a computer-generated illustration of a post. The post is colored a dark red and the front end of the impact vehicle is illustrated near the top left-hand side of the structure. The entire post remains in tact in this first image.
The second image in this figure shows a computer-generated illustration of a post. The post appears to be bent ever so slightly from the mid-point of the structure and arcing outward both to the upper and lower halves. The bottom left-hand side of the post also appears to have deteriorated slightly.
The third image in this figure shows a computer-generated illustration of a post. The top half of the post now leans slightly to the right as a gap has begun to form near the mid-point of the structure. The deterioration at the bottom left-hand side of the post has increased in both width and length, now running nearly half the length of the lower half of the structure.
The fourth and final image in this figure shows a computer-generated illustration of a post. The top half of the post leans considerably more to the right and the gap at the mid-point of the structure has widened. The gap itself appears to be a clean and even break. The deterioration near the bottom left-hand side of the post has increased, again both in width and length, now extending around either side of the post and up to the mouth of the gap itself.
FHWA-HRT-05-096
