Traffic Light Signals

Traffic Light Signals

Traffic lighting is used to control the flow of traffic. They're also known as traffic lamps, stop lights, stop and go lights and robots. They're designed specifically for use as signalling devices and tend to be positioned where the road intersects with other flows of traffic, whether it is motor vehicles or traffic, such as pedestrian crossings, a crossroads or other locations to control the flow of traffic.


The majority of the cities around the world have these installed to inform the road users through lights in standard colours. The colour code is universal and contains a precise sequence, as well as the colours used are red, amber and green. The precise sequence is very helpful for people who are colour blind.

The traffic lights that are most commonly in use incorporate a set of three lights, red, amber and green. They are generally set up in a vertical position together with the red light at the top, amber light in the middle and the green light at the bottom. In some countries traffic lights may be set up horizontal.

When a vehicle approaches a collection of traffic lights as well as the light on the signal is red, it's an indication to that vehicle to prevent. The amber light suggests that the lights are planning to change, either to red or to green depending on which country you are in. When the lights switch to green it is signalling that it must be safe to proceed and also the vehicle may continue its journey.

The variations in the use of traffic lights will change depending on the country and then any special needs for a particular intersection, for example special lights may used for buses, pedestrians and bicycles etc; or special rules for controlling traffic which are turning in a particular direction. Some intersections can be very complex and will utilize any combination of these.

The very first traffic lights were installed away from Houses of Parliament working in london, Great Britain in 1886 possibly at the time looked like railway signals with semaphore arms and red and green gas lamps.

The modern electric traffic lights was as a famous invention, and the first interconnected signal system was positioned in Salt Lake City in 1917.

How long the amber light is illuminated can vary and in many places it's 5 seconds. Occasionally it may be as little as 3 seconds which considerably cuts down on time the driver needs to react. These times generally vary based on the set speed limit, and longer times receive for higher speed limits.

Lighting is used in other types of road signs including ' Slow Down' signs and fog warning signs which are illuminated when required, or in the case of an slow down sign they are often electronically activated since the speeding vehicle approaches.

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