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Introduction
The public's understanding of the traffic signal system
functions can improve driving habits by reducing
speeding and the associated traffic accidents. The more
drivers know about the operation of traffic signals, the
less they will be frustrated when waiting for signal
changes.
Garrett A. Morgan
invented the traffic signal during the 1920's. The very
first traffic lights did not even have lights at all.
They had signs that said stop and go.
How does a traffic
light work can be a good subject for a science project.
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