Police officers giving traffic signals.
The traffic light as we know it today was invented by Garrett Augustus Morgan, the son of former slaves. Before that there was a gas lantern signal light in England, but that was before automobiles. There was a railroad light version later, but it wasn't like our modern version. If you didn't mean "traffic light" then i don't know.
Stop signs
The gas-powered traffic light was invented in 1912 by Lester Wire in Salt Lake City, Utah. Wire's invention used natural gas to power the lights, replacing manual operation.
Oil lamps where used. Candles were also used.
A yield sign at a traffic light is typically used to enforce specific rules at an intersection, such as requiring drivers to yield to pedestrians or oncoming traffic before proceeding. This helps regulate the flow of traffic and ensures safety.
thay used candles and other objects that has light
inventor of the traffic light
Before the light bulb was invented in the late 1800s by Thomas Edison, people used candles, fire, oil lamps, or gas lamps or lights to create light while it was dark.
They used candles, lots & lots of candles.
Before fire was invented, early humans likely used natural sources of light such as the moon, stars, and bioluminescent organisms like fireflies. They may have also used reflective surfaces like water or snow to amplify available light sources.
The walking man traffic light, commonly used to indicate when pedestrians can safely cross streets, was invented by traffic engineer William P. McCauley in 1951. This innovative traffic signal design was first implemented in New York City to improve pedestrian safety. The symbol quickly gained popularity and has since been adopted worldwide to enhance clarity for both pedestrians and drivers.
John Peake Knight invented the traffic light in London, England, in 1868. His design was a gas-lit signal that used colored lights to control the flow of traffic at intersections. Although it was primarily intended for horse-drawn carriages, this invention laid the groundwork for modern traffic control systems.