0
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.
What else can I help you with?
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!
Why is traffic lights invented?
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.
What was invented before the traffic light?
use lights on cars
Who invented the three position traffic lights?
garrant morgan
Why were traffic lights invented and what problem were they designed to solve?
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.
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.
Where did lester wire invent the traffic lights?
Lester Wire did not invent traffic lights. The modern electric traffic light system was invented by Garrett Augustus Morgan in 1923.
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
