| 摘要 |
A traffic signal having a four sided housing, each side of which contains red and green areas which can be illuminated. Furthermore, each side contains a rotating semi-circular mask which simultaneously, progressively covers one portion of one of the colored areas and uncovers a portion of the other colored area until the illumination of the traffic light is changed thereby causing a change in traffic flow. The rotation of the masks together with the actuation of the various lights is controlled from a common ring gear disposed within the housing and driven by a single motor.
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