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.