That reminded me of a poem by Ogden Nash, which I had memorized as a child; "I'LL TAKE THE HIGH ROAD COMMISSION".
In between the route marks And the shaving rhymes, Black and yellow markers Comment on the times. All along the highway Hear the signs discourse:
MEN S L O W WORKING ; SADDLE C R O S S I N G HORSE .
Cryptic crossroad preachers Proffer good advice,
Helping wary drivers Keep out of Paradise.
Transcontinental sermons, Transcendental talk:
SOFT C A U T I O N SHOULDERS ; CROSS C H I L D R E N WALK .
Wisest of their proverbs, Truest of their talk, Have I found that dictum:
CROSS C H I L D R E N WALK .
When Adam took the highway, He left his sons a guide:
CROSS C H I L D R E N WALK ; CHEERFUL C H I L D R E N RIDE .