I remember a movie that starred Johny Cash as a truck driver who couldn’t read. I wondered how he could do that, without being able to read signs, addresses, maps, etc.
I remember that movie! I think it was an ABC Movie of the Week. I was about 10 when I saw it; the scene I remember centered around a complex and confusing array of traffic signs at an intersection, and he had to guess what they meant. He guessed poorly and got a ticket.