| 摘要 |
A portable apparatus providing for a temporary installation of a traffic control signal meeting the visual display requirements as specified by government authorities for standard traffic control lights. The apparatus includes a standard which is adapted to support the traffic signal heads at proper positions, both alongside the roadway and in an elevated position above the roadway, a control box for controlling the operation of the signal either in accordance with a pre-set program or in accordance with signals generated automatically or manually in response to traffic flow, a base element having means to anchor the unit firmly in place and to hold the vertical mast, the vertical mast with means for mounting the signal head at a proper elevation alongside the roadway, and a mast arm or boom pivotally attached adjacent to the upper end of the mast so that the boom can be readily positioned in a substantially horizontal alignment above the roadway and means to securely anchor the boom in the horizontal position, the boom also having means for mounting a signal head. The apparatus is designed to be carried and erected with a minimum effort. The base may be a separate piece, or a fitting firmly attached to a vehicle, or a semi-permanent installation attached to the ground. The vertical mast is releasably engageable with the base, said mast and base having cooperable elements facilitating erection and locking of the mast in a vertical position. An improved traffic control signal section is in the form of a lens assembly which combines the functions of the traditional housing and reflector in one piece to reduce the weight and cost of the assembly, the construction permitting ready maintenance of the system.
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