A childhood belief about traffic lights

One day at age 17 I was riding in my boyfriend's car (also 17 at the time) in his neighborhood. We came to a red light on a main road that had a bright blinking white flash, and since there were none of those in my neighborhood, I asked him what it meant. He told me, "It's for the blind people who drive." I informed him that blind people don't drive, and he was startled at this burst of logic. His father had told him this story years earlier, and he had never thought to question it.