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.
in the 1920s in the us.
garrett morgan invented traffic lights in the year of 1920
He invented the traffic lights!
Traffic lights were invented to regulate the flow of vehicles at intersections and to prevent accidents. They help to improve traffic efficiency and safety by providing clear signals to drivers on when to stop, go, or yield the right of way.
use lights on cars
garrant morgan
Traffic lights were invented to regulate the flow of traffic and prevent accidents at intersections. They were designed to solve the problem of chaotic and dangerous traffic conditions by providing a clear and organized system for vehicles to follow.
Traffic Lights were invented by an engineer named J.P. Knight and the first one was put to use in 1868.
Lester Wire did not invent traffic lights. The modern electric traffic light system was invented by Garrett Augustus Morgan in 1923.
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.
Garrett Morgan invented trafic lights so cars wouldn't crash into each other.
* The disadvantages of traffic lights r * Traffic lights can cause a chaos on the roads.* Also cause a huge traffic