Science on the 20th of November 1923 in history

Science

Date	Type	Text
20 Nov 1923 Traffic signal	science	Traffic signal In 1923, African-American Garrett Morgan (1877-1963) patented an automatic traffic signal. He later sold the technology for the Morgan traffic signal to General Electric Corporation for $40,000. His invention came after he had seen an automobile crash into a horse-drawn carriage. Morgan was distressed by that traffic accident, and so he developed a new way to make streets safer for motorists and pedestrians.	0

19th November 1923 21st November 1923

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Science on the 20th of November 1923 in history

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