| 摘要 |
In a safety mechanism for highway exit ramp, dual motions are provided in the structural operation of the mechanism wherein a warning member, such as a length of barrier or semaphore, is pivotally mounted between an upright position and into a horizontal and cautioning disposition across the roadway, but in addition, the warning member itself is horizontally pivotal in the event that a moving vehicle should strike the same. The mechanism includes a detection member, such as either a protruding device capable of being pivoted by the vehicle passing thereover, or an electronic detecting device as provided in the roadbed of the ramp and when encountered by a vehicle travelling in the wrong direction disengages a detent that releases a spring mounted rack that turns its pinion for pivoting the warning device across the roadway. The horizontal pivot to the warning device is acquired by means of another pinion mounted to a cylindrical member that supports the warning device, and this pinion engages with a rack that is spring biased for normally centering the warning device perpendicularly across the roadway of the ramp, but which is capable of being pivoted out of this perpendicular orientation as when encountered by a vehicle.
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