| 摘要 |
<p>A device for selectively allowing and preventing the passage of one or more vehicles along a pathway, the device comprising: a frame (11) for, in use, insertion into the pathway; a blocking element (21) connected to and movable relative to the frame between a first position in which, in use, the blocking element allows passage along the pathway and a second position in which, in use, the blocking element projects from the frame so as to prevent passage along the pathway; and a latch element (24) on the blocking element for engaging with the frame when the blocking element is in the second position.</p> |
