1. When people stop while driving because they see someone they know walking on the sidewalk, and start
talking to them, stopping traffic one way.
2. When people stop while driving because they see someone they know driving next to them in the same direction, and start
talking to them, stopping traffic one way.
3. When people stop while driving because they see someone they know driving a different way than them, and start
talking to them, stopping traffic both ways.