Blind Spot

Clay's been asking a lot of questions recently about things like skin color and other differences that people have. At the end of our neighborhood there's a sign that Clay asked about. It says "Blind Pedestrian". I told Clay that there must be someone in the area who can't see and that the sign warns drivers to be careful. This, of course, started the usual cascade of questions; "Why can't someone see?", "Why don't they wear glasses like you to see?", "How do they know where they are?" After trying my best to answer these, Clay says, "Well if they drive and get into a wreck, they will have their car taken away, right?" Right. How can I argue with that. The way most people drive around here, they might be blind.