| 摘要 |
A speed deterrent apparatus for road vehicles comprises an element (31) mounted for movement between a first position substantially level with the road surface, and a second position e.g. raised above the road surface. A control means, such as a similar element (30) responds to an approaching vehicle to operate a link (32) and cam (34), preventing the element (31) from being depressed by the vehicle wheel for a predetermined time period. Thus if the vehicle is travelling at greater than a predetermined speed, the element (31) presents a raised obstruction over which the vehicle wheel must pass. |
