| 摘要 |
<p>Apparatus for arresting the progress of vehicles is disclosed, comprising an assembly of modules, each module having at least one blade movable from an operative position protruding from the module to a retractive position, the blade being movable together by a mechanism extending across the modules, wherein the modules are interconnected in such a manner that the assembly can be rolled up, or unrolled to lay the assembly across a surface to be protected.</p> |
