Stop Lights

As I was stopped the other day,
I wondered why they looked that way?
Red and Green and Yellow too,
who decided what they do?
I looked it up to feed my brain,
the first was used to stop a train.
Then someone brought them to the states,
causing endless autos waits.
The colors used evolved in time,
none the colors would be mine.
Though no one asked – but if they had,
I’d tell them all should be in plaid.