00:00 The invention of the traffic light is up for debate, but the first one is often credited to Cleveland in August of 1914.

02:00 The first traffic signal was invented in London in 1868, but it was abandoned after a month due to a gas light explosion, and it took another 40 years for traffic lights to be reintroduced.

04:06 The first traffic signal was abandoned after a gas light explosion, and it was the Americans who reintroduced the idea and are credited with inventing the first traffic signal, although it was first invented in London.

06:08 Lester Weier, a man who doesn't get much credit outside of Mormon-held areas of Utah, is mentioned.

08:16 Lester Weier created a wooden box with red and green lights attached to trolley wires in Salt Lake City in 1912, two years before the first traffic signal in Cleveland, but James Hogue is credited with the first traffic signal in Cleveland in 1914, while William Giglieri of San Francisco had the first automatic light in 1917, and William Potts in Detroit developed the first system with a caution light in 1920.

10:25 Garrett Morgan invented the first traffic signal with a caution light in 1923, which had three positions and allowed all directions to stop for a moment, improving safety at intersections.

12:25 John Allen came up with the idea of sponsored traffic signals in the 1930s, but thankfully it didn't catch on.