What characterized the traffic control device erected in Detroit in 1920?
Answer
It was manually operated and used four arms
A manually operated traffic signal was erected in Detroit in 1920, which utilized four arms that needed to be physically moved to direct traffic.
Related Questions
What critical element did Garrett Morgan introduce to automated traffic control systems?When and where was the earliest known gas-burning traffic signal system installed in the United States?What was a significant design flaw in the existing two-light traffic signals that Morgan aimed to correct?What distinct operational mode was incorporated into Garrett Morgan's T-shaped three-position signal?Which company purchased the rights to Garrett Morgan’s traffic control signal system?What U.S. Patent Number is officially cited for Morgan's traffic control signal system?What was one of Morgan's other notable patented inventions mentioned in the text?What characterized the traffic control device erected in Detroit in 1920?According to the text, what is the distinction key to understanding the narrative surrounding the invention?In what month and year was Garrett Morgan granted his patent for the traffic control signal system?