Gisella's School

This week in history I decided to write about the traffic light.

            Increasing traffic congestion on roads in the 18^th century led to increased traffic-related deaths. JP Knight invented the traffic light in 1868 for the London Bridge Project based on his experience with train traffic. Traffic lights regulate the flow of traffic, increase car volume, and reduce accidents and injuries. They spread to the U.S. in the early 1900s in major cities like Toledo, Detroit, and LA. They reduced the police force required to enforce traffic and improved highway efficiency.