Chapter
The Evolution of Traffic Lights
09:27 - 13:58 (04:31)
This podcast episode discusses the history of traffic lights, starting with the development of the first automatic traffic light system with a caution light by William Potts in 1920 and the integration of caution lights into traffic lights in the 1930s.
Clips
Lester Wire invented a wooden box with red and green lights attached to the trolley wires overhead that allowed for the regulation of trolley schedules, which predated similar inventions in Cleveland.
09:27 - 09:49 (00:22)
Summary
Lester Wire invented a wooden box with red and green lights attached to the trolley wires overhead that allowed for the regulation of trolley schedules, which predated similar inventions in Cleveland.
ChapterThe Evolution of Traffic Lights
EpisodeShort Stuff: Traffic Signals
PodcastStuff You Should Know
The history of traffic lights dates back to the early 20th century when William Potts and William Giglieri introduced their automatic traffic light systems in Detroit and San Francisco, respectively, with Potts being credited with developing the first traffic light to use all three colors with a caution light.
09:49 - 12:38 (02:48)
Summary
The history of traffic lights dates back to the early 20th century when William Potts and William Giglieri introduced their automatic traffic light systems in Detroit and San Francisco, respectively, with Potts being credited with developing the first traffic light to use all three colors with a caution light.
ChapterThe Evolution of Traffic Lights
EpisodeShort Stuff: Traffic Signals
PodcastStuff You Should Know
The invention of the traffic signal began as a way to control the flow of people and vehicles in large cities.
12:38 - 13:58 (01:19)
Summary
The invention of the traffic signal began as a way to control the flow of people and vehicles in large cities. Early designs included using hand signals for police to direct traffic, but eventually evolved into the familiar red, yellow, and green lights that we know today.