This diagram shows a long rectangular column encased by two shorter and wider rectangular columns on either side of the first. The two wider structures are colored a dark green and are tied together by four cross bars, which reach over the longer structure which itself is colored a dull pink. The two wider structures run up the sides of the longer structure and stop at about the half way points. At this point, the pink structure is titled severely to the right, the structure torn and jagged at the point of impact.
FHWA-HRT-05-096