| 摘要 |
A barrier comprising a generally rectangular tray (10) with upstanding peripheral walls at least at the rear (12) and sides (52, 58), at least one cover member (16,18) pivotally mounted to the tray to be movable between a lowered inoperative position for a vehicle to drive thereover and a raised operative position upstanding from the tray, and means (20) within the tray for moving the at least one cover member between the inoperative and operative positions, the at least one cover member when in its operative position creating a step of sufficient height substantially to prevent vehicle passage thereover. <IMAGE> |
