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The term "stoplight" meaning a traffic signal is semáforo. The word for a brake light on a car is luz de freno.
If there is a light labeled right turn signal and it is red, you can not legally turn.
A signal light that is not working.
Stop light is another name for a traffic signal.
On a vertical display traffic signal the green light is on the bottom. On a horizontal display traffic signal it is to the right, but may depend on that state (or municipality's) practice.
Railway signal
The impact of a traffic lights on a highway or street is to drastically reduce the maximum traffic carrying capacity of that road. During rush hour traffic is always backed up when a light turns green, because more vehicles are arriving at the stoplight than can get through it.
You must stop
The light reduces the chance of an accident, causing the traffic congestion to go down the most during rush hour.
The first ever traffic light signal was set up in Britain, in 1868. In front of the British Houses Of Parliment, by railway engineer J. P. Knight. But.. is, in fact an American invention. In 1912, an officer named, Lester Wire, set up the traffic light in Salt Lake City, Utah. Reference: http://en.wikipedia.org/wiki/Traffic_light#History
Amber in the traffic signal means caution. Generally, it is best to stop on an amber light.
The lowest light on a traffic signal is green. Some cities use traffic lights that are not arranges top to bottom but rather side to side. In this event the green light is usually the furthest to the right.