Traffic Lights

Traffic lights are safety devices that control the flow of traffic on roadways, railways, and waterways by signalling which way the traffic is to proceed and for how long. There is a universal colour code of red for stop or wait, yellow for caution or transition, and green for go, but beyond that signals vary even within a single country. The most common traffic light system has three vertically-stacked lights facing the driver with red on top, yellow or amber in the middle, and green at the bottom. In areas where wind is a factor, the lights are placed horizontally with the ordering of the colours remaining the same when read from left to right.

The traffic light manufacturer had started producing automated roadway traffic lights in earnest by the mid-1920s in North America, the U.K., and Australia. From then on, traffic lights started specializing in different types of traffic. For pedestrian safety, the traffic light supplier provided traffic signals with coordinated sounds to accommodate visually-impaired pedestrians, and the lights were standardized into different shapes for the benefit of the colour blind. The European standard is to use a pictogram of a person or cycle lit up in the appropriate colour. Other variations include a green walking man or red standing man pictogram. In North America, the words “walk” or “don’t walk” are used, but pictograms are becoming more common. Using it’s possible to source a traffic light manufacturer or suppliers.

Railway traffic signals developed earlier than roadways signals and use a combination of colour and semaphore to inform the train driver of the rail conditions ahead. When electric lights became bright enough to be seen during the day, railway signals moved to lights. More recently, traffic lights for railways and roadways indicate traffic flow by spatial arrangement of the lights rather than the colour of the lights. As the traffic light manufacturer continues to improve on traffic safety, the traffic light supplier needs to keep up with the innovations.

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