IF people could not see colors, how would traffic lights work? Design a traffic system that does not rely on colors

you could just have a sign that said GO, STOP, YIELD and each one would light up when it was needed

Explanation:

They would just have to remember what order of each light and what they mean.

b. failure at least that one seems the most negative out of all of the answers provided pls correct me if i'm wrong. : ))

the answer to "what does the narrator realize by the end of the story" is b.