Traffic control signals
Traffic control signals are lights that use the colours green, yellow and red to control the flow of traffic at intersections or where roadways merge. The colour of the light determines which stream of traffic has the right of way. The traffic control signal may be vertical or horizontal.
Original Article Source Credits: Alberta.ca, https://www.alberta.ca/
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Link to Original Article: https://www.alberta.ca/traffic-control-signals.aspx