Interstate 10, Near Phoenix, AZ State Prison: Do Not Stop for Hitchhikers Unknown Location A sign indicates a left bend in the road. Underneath is a sign stating "Keep Right". Rim Drive, Durango, CO Warning: Do Not Hit This Sign Unknown Road, Clemson, SC Caution water on road during rain. Smoky Mountain National Park, Tennessee If tunnel is dark, remove sunglasses. Jefferson City, Missouri High School Football Field Public Property, Keep out! South Side of San Antonio, TX Cemetery Road. Dead End Road Construction Points, New Jersey Various state-issued construction signs in a childish handwriting say: "Slow down my daddy (and mommy) works here" and "FREE Speeding Tickets Ahead!"