Found doodled in the margins of a high school note unaccountably preserved from sometime in the 1980s. Words were drawn with appropriately-shaped road signs. I think if I won a lottery, I would order some of these and place them along various highways:

Divided Mind Resumes
13 km


DANGER FROM:
Psycho Killer in Back Seat


Caution: Tacks Spread on Road


Bias Ahead


<--ONE WAY-->


DANGER
Falling Mixmasters
Next 30 km


Speed Limit Changes at Random


This Lane Ends During Full Moons


SIGNS AHEAD


GO


Exit Closed in April


This Lane Does Not End
Ever.
You must continue in this lane for eternity.
Mwahaha!

v


Chariot Inspection Station


PAUSE


Slippery When Dry


Esophagus Crossing


TRAUMA Next 16 km


Philosophy and Toasters!


Be Prepared to Cough


Oral Test Ahead


Last Novelty Store 290 km


Beware of Falling Principles


DANGER: FALLING ROCKS
Weekdays: 7:30 am - 5:00 pm
Saturday, Sunday, and Holidays: 7:00 am - 3:00 pm


Porpoises at Work


SCHOOL CROSSING
(Sketch of old-timey school crossing a highway)


Highway Ends
(Silhouette of car going over cliff into flames)


SIGNS PROHIBITED