| 摘要 |
A barrier adapted to be set up for temporary traffic control comprises a man-portable unit placed on the ground from which a boom, preferably in the form of a reelable tube, can be withdrawn. The boom extends at an oblique angle to the ground in its "down" position and a motor within the ground-standing unit can raise and lower it between that position and an "up" position at a greater angle to the ground in which traffic can pass.
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