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Because, as roads got busier with automobiles, the number of accidents at intersections increased and the number of policemen required to direct traffic at each junction became economically unviable.
An automated system - first gas-powered and consisting of an arm with "stop" on it dropping down later changed to electric and later still to multi-color lights - saved money in wages, cut the number of accidents and allowed for the steady increase in cars.
Wiki User
∙ 16y ago
Wiki User
∙ 14y agoThe traffic light was invented to prevent collisions in an intersection
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Why is traffic lights invented?
traffic lights were invented because at intersections increased and the number of policemen required to direct traffic at each junction became economically enviable
Where was the traffic lights invented?
in the 1920s in the us.
In what year did Garrett Morgan invent traffic lights?
garrett morgan invented traffic lights in the year of 1920
Why is Garrett Morgan famous?
He invented the traffic lights!
What was invented before the traffic light?
use lights on cars
Who invented the three position traffic lights?
garrant morgan
Who invented the Traffic Light and in what year?
Traffic Lights were invented by an engineer named J.P. Knight and the first one was put to use in 1868.
When where traffic lights invented?
On December 10 1868, the first traffic lights were installed outside the British Houses of Parliament in London, by the railway engineer J. P. Knight.
Why did Garrett Morgan invent the traffic lights?
Garrett Morgan invented trafic lights so cars wouldn't crash into each other.
What are the disadvantages of the traffic lights?
* The disadvantages of traffic lights r * Traffic lights can cause a chaos on the roads.* Also cause a huge traffic
Who controls traffic lights?
No one really controlls the traffic lights. A computer system controls the traffic lights, and no humans are involved with controlling the traffic lights day in and day out. It is all automated these days.
How often do traffic lights burn out?
The new traffic lights are now LED lights and do not ever burn out.
