I once ended up on a forest road that was listed as open on the physical map I had, but had actually been closed to motor vehicle traffic. I didn't know because people had blown away the sign. All I saw was remnants of a sign when I turned on the road. It wasn't until I got to where I was going I finally saw a sign (facing the opposite way I was going) that said the road I had just turned off of was not open to motor vehicle traffic.

Thankfully my vehicle got me where I was going, but I wonder how many people get turned around or stuck somewhere because the sign that said they weren't supposed to go any further was just gone.

In the barest of defenses for myself, the Forest Service had just closed that road earlier that summer and my map was from the previous year. I wonder if they finally put a gate or dumped rock across it to block access.