Warning!

Warning!
Correctional facility
do not pick up hitchhikers.

This is an actual road sign in Colorado. It struck me as odd.

While it is a good idea to warn travelers against picking up hitchhikers near the prison, I worry about the implications of this sign. Did they have a lot of problems with inmates getting away? Are escapes so common that it's a regular occurrence for escapees to be picked up by cars driving by?