| 摘要 |
The wall is made from a variable number of tubes or rolls in a variety of sizes, divided by inner partitions and filled with compressed air or water to absorb impacts from vehicles. Some of the tubes (1) are filled with water for fixing to the ground, while others (2) contain compressed air. In both cases their inner partitions have safety valves which allow water or air to circulate from one compartment to another. A grooved rubber mat can also be welded to the wall to guide any impacting vehicle towards the middle tubes.
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