You see the signs in a lot of towns. They're rectangular and have a stick figure to warn motorists to yield to pedestrians in crosswalks.
The Pennsylvania Department of Transportation estimates that at least 5,300 signs have been placed across the state in the past 12 years.
Sometimes the signs are placed in the middle of the block, not at crosswalks.
The signs do not assure safety. They can even be dangerous, not only to pedestrians but to motorists who risk a rear-end collision for stopping abruptly.