| 摘要 |
A bollard including a series of at least two nested, inverted U-shaped forms of decreasing height set around a common vertical axis. Each form has an upper transverse portion and two parallel, vertical legs extending therefrom. The U-shaped forms are made of metal pipes, and have physical characteristics such that on impact by a moving vehicle, including an automobile or a truck, the U-shaped forms will initiate a "crumple zone" type reaction, so as to meet governmental standards addressing the threats posed by vehicular traffic.
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