International Traffic Light Day
By 1914, there were more automobiles on the road than ever, and they  were still sharing the streets with streetcars, horse carriages,  merchant carts, and more. There was a need for regulations to make sure  traffic moved smoothly and that accidents would decrease. At the time,  traffic was controlled by the police. But traffic lights were about to  come along and make road navigation easier, safer, and more efficient.
On August 5, 1914, what is considered to be the first electric  traffic light was installed in Cleveland, Ohio, at the corner of East  105th Street and Euclid Avenue. It had four pairs of red and green  lights, one for each side of the intersection, and a warning buzzer that  indicated when the light was about to change. It had to be operated  manually by someone in a nearby booth. It was based on a design by James  Hoge. He had previously applied for a patent  for a "Municipal Traffic Control System," and his patentâ#1,251,666âwas  approved in 1918. The Cleveland Automobile Club thought that their new  traffic light might revolutionize the handling of traffic in crowded  cities.
There were other early traffic signals and traffic lights, both  before and after Cleveland's and James Hoge's lights. In 1868, a gas-lit  and manually-operated traffic sign was installed in London. It had two  arms: one said "stop" and the other said "caution." Tragically, less  than a month after its installation, it exploded and the policeman who  was operating it was injured.
In 1910, the first automated traffic control system was created. It  didn't light up, but it did display "stop" and "proceed." In Salt Lake  City in 1912, a traffic light of red and green lights was installed in a  wooden box on a pole. William Potts, a police officer from Detroit,  Michigan, invented the three-color traffic light to be used at four-way  stops in 1920. In 1923, Garrett Morgan invented a traffic signal with a  T-shaped design; he patented it and later sold it to General Electric.  Traffic lights have continued to improve over time. Lights first had to  be changed manually, then they could change automatically, and then in  the 1950s computers began being used to control them. Computers allowed  detection plates to be installed as well, which could sense when cars  were present. Traffic lights also expanded beyond the basic red, yellow,  and green lights, and began including other lights such as turn arrows,  and walk and don't walk lights.
Traffic lights control the flow of traffic and are placed at  locations such as road intersections and pedestrian crossings. They go  by many other names, which are sometimes dependent on where in the world  they are. Some common names include traffic signals, traffic lamps, and  signal lights. They are made of lamps or LEDs, and their standard  colors are red, yellow (amber), and green. A solid red light means that a  driver should not proceed, while a flashing red light is to be treated  like a stop sign. A yellow light indicates that a red light will soon  appear. In some areas, it may require a driver to stop if they can, but  in other areas, drivers may be allowed to pass through it if it is safe.  If a yellow light is flashing, it means it is a warning signal. A green  light means that a driver may proceed if it is safe and if there is  room on the other side of the intersection.
Traffic lights may be set to flash at times when traffic is sparse,  such as late at night. Sometimes a flashing yellow is set to a main  road, while a flashing red is set to the side road. Sometimes there is  flashing red in all directions, which is treated as a four-way stop.  Whether lights are green, yellow, or red, or whether they are solid or  flashing, we celebrate them today, on the anniversary of when the first  electric traffic light was installed.
How to Observe International Traffic Light Day
Today  is for stopping and thinking about the importance of traffic lights in  road safety. The best way to celebrate the day is probably to use as  many traffic lights as possible when driving. If you are up for a long  drive, you could drive to the intersection in Cleveland  where the first electric traffic light was installed. You could also  drive to Ohio's Small Town Museum, where what is believed to be the world's oldest traffic light is kept.