| 摘要 |
A motorized retractable speed bump (12) or warning device wherin the raising and lowering of the retractable speed bump (12) is controlled by the multiple remote means from signals generated by traffic conditions. The motorized retractable speed bump (12), wherein the speed bump is comprised of bi-folding hinged plates (3, 7), these retractable plates are elevated to present a visible obstruction to motor vehicles, and a position restraining device (19, 21, 23, 23', 25, 29, 31, 39, 39', 45, 47 and 53), operated by rotary and/or linear motor drive means (61), by an on/off manual push button switching, or through a series of programmable logic controllers, by way of analog or digital signals emanating from permanently mounted speed detecting device of prior art, such as radar, lasers; infra-red; electrical induction loops; electric eyes, or the like; vehicular mounted radar; laser; sonic; light emitting; radio frequency transmitters; or other existing state of the art signalling means. |
