One afternoon in 1923, Garrett Augustus Morgan saw a collision between a car and a horse-drawn carriage. Incident in front of his eyes was disturbing his mind, especially because of collision events that often occur in the streets. "There should be a regulator of the flow of vehicles on the streets that are effective, thus driving so safe" so maybe he thought at the time.
Actually, when it has no system perngaturan traffic with stop and go signal. The light signal was used in London in 1863. However, the use of these light signals suddenly exploded, so its use is stopped. Morgan also felt the stop and go signal has a weakness, namely the lack of interval / lag time for road users.
Morgan then added a yellow light as a pause between the stop (red light) and go (green light). Yellow light also gives the opportunity to stop and walk slowly. When it resembles the letter T. During its development, the arrangement of the three lights changed. Morgan creation lamp is then developed and used as a traffic light until now.
Indeed, before Morgan invent the traffic light versions, since 1868 JP Knight had made a traffic control in the UK, which is installed outside the British Houses of Parliament. Morgan regulating traffic is like semaphore flags. When the night, the red and green lights replace the "flag" is. Origin of illumination? Of gas power. One time in the same year, the lamp exploded and injured a policeman. Its use is stopped.
On his journey, was later replaced gas power electric power, but still a hint "stop" and "street" course. On August 5, 1914, the American Traffic Signal Company installed a system at two signal lights on Ohio street corner. James Joge, the designer, add a bell to light two colors, as warning lights change. These lights can be controlled by the police and firefighters in an emergency.
In the early 1920s, traffic light with three colors was made by a police officer, William Potts, in Detroit, Michigan. Until finally in 1923, Garrett Morgan patented a traffic signal device, as the forerunner of the modern traffic light three colors.
In 1917, the first traffic lights run interrelated with one another. Antarlampu interconnection is run at six intersections controlled simultaneously with a manual switch. The first traffic lights were operated automatically introduced in March 1922 in Houston, Texas. Here are the colors for the traffic light and a brief history of how the color is used as a symbol for the traffic lights.
Red color
Red means stop or danger or prohibition. Red color identical to the color of blood, since time immemorial humans often fight to fight over something and other BerbagaiHal. Fighting means killing each other, hurt each other and each other bloody. Many of the victims of the war who were injured and some even killed. Neither victim was injured or killed for sure body will release the blood. As we know that all humans have red blood. And if the injured man would bleed and hurt.
With the changing times, there is an anti-human group with the war, and declared that the war was dangerous, it was agreed and made a rule not to fight each other, hurting and killing each other as fellow human beings is very dangerous. With such a rule stage, which can injure alert, alert danger, harm or danger prohibited. So until now the red color used as a symbol for things that harm or prohibition.
Yellow color
Yellow means caution, alert or slowly. Yellow color identical to the color of fire, the fire has properties between the two options, namely a small fire can be controlled, and a large fire that is difficult to control and can be dangerous. Rules yellow at risk can be safe and can not be safe or dangerous, as well as fire, either fire small or large fire has thermal properties, and humans will always be careful with fire.
Ancient humans in war is always to use a fire, either for weapons, communications signals, symbols and illumination. In situations of war, soldiers are always required to be alert and watch out for enemy movements, especially at night. They would use fire to everything, they will observe the movement of the enemy by looking at the use of fire, so if there is a fire or torch enemy movement they would get ready and alert to face the enemy attack. So until now the yellow color has been agreed upon as a symbol for caution, alert or get ready. Yellow leaf color can also be identified that are old that soon the leaves will fall. Thus, the yellow color is defined as a transition or transition.
Color Green
Green color means or allowed to run free or safe. The green color is identical to the natural color, the color of the leaves on the forest especially herbs. Almost all colors of the leaves of plants of the same color is green, though most small plants have different colored leaves. So why the color green is synonymous with freedom?
Many of the herbs in this world different in kind, nature, variety, style and shape, faction and assorted others. But almost all the leaves have a green color, the meaning of the word free to all green, and there is none forbid, either of the plants themselves and derived from a different species. So the green color has a meaning of freedom. The green color also has a sensitive nature of our vision, have eye color refreshing, especially for color therapy. So that the green color is very safe for our eyes. And finally agreed the color green as a symbol for freedom and safe or permissible and allowed.
Reasons Why The location of Red Light on Top, Yellow and Green in the Lower Middle
As we know, the color used for the traffic light is red, yellow, and green. Red indicates stop or a sign of danger, yellow indicates caution, and green indicates allowed to run. At the beginning of its discovery until about the 1950s, many traffic lights, especially in busy urban intersection, mounted horizontally, and not vertically as it is today. The design of the vertical as it is now, the red light is on the top position is meant to facilitate people with color blindness.
Also, usually, light red contains some orange hue, and the green light contains some blue shades. It also meant that people with red and green color blind can see the signal lights are lit. In addition, in the United States, traffic lights have extra white fringe that can be lit in the darkness. It aims to help people who are color blind can distinguish light vehicles with traffic lights.
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