What Are the Black Boxes on top of Traffic Lights?

Answer

Traffic lights are signaling devices positioned at road intersections, pedestrian crossings and other locations to control competing flows of traffic. The black boxes on top of traffic lights are traffic sensors that dectects traffic movement, so aiding the flow of peak time traffic.
Q&A Related to "What Are the Black Boxes on top of Traffic Lights"
No, they aren't red light cams if they are "little". Post a link to a pic? It really depends where you are. In certain areas the traffic lights can be "captured"
http://uk.answers.yahoo.com/question/index?qid=201...
A Sensor device to tell when Emergency vehicles are coming (Stobe light) and when a vehicle is at light.
http://answers.yahoo.com/question/index?qid=201204...
1. Measure the length of the area that you want to be covered by the blackout curtain. If you are really trying to eliminate all light entering through your windows, hang the drapes
http://www.ehow.com/how_5879755_hang-drapes-block-...
RED AMBER (Orange) GREEN
http://wiki.answers.com/Q/What_color_are_trafic_li...
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