A traffic light (also known as a traffic signal or stoplight) is a signaling device positioned at [[intersection|road intersections]], [[crosswalk]]s, and other locations in order to control the flow of vehicular traffic.  Traffic lights consist normally of three light signals of the colors red, yellow, and green/blue arranged vertically or horizontally in that order.  While this is standardized internationally, variations may exist.

h4. See also

* [[Pedestrian lights]]
* [[Road sign]]
* [[Road]]
* [[Street]]
信号機 信号