ABSTRACT
Imagine that you are standing on a busy street corner. You look at the people around you. What do you see?
A woman drops a postcard in a mailbox. Across the street, a man carrying a small suitcase steps off a bus. Several feet away from you, a couple is arguing about something. A police car slowly passes through the intersection. Less than half a block away, someone is jaywalking while a small child nearby reads a street sign. A man deposits money in a nearby parking meter. A stranger approaches and asks that you sign a petition in support of banning cell phone use by drivers.
