I drive on I-5 in California, and the exit signs posts if there is a jail, state mental hospital, prison, detention center at that particular off ramp. Is there a policy where this is required? Why are incarceration centers posted on freeway exits?
edit: Can you please cite a policy that requires these detention centers to be posted? Is it a federal policy or a California State policy?
Because non-incarcerated people need to go there too? Visitors, new employees, picking up someone being released, protesting wrongful detention, etc. And also the thing about hitchhikers the other person said.