In the US, I'd be trespassing and could expect police to say something. For a long time, it felt like I was doing something wrong or illegal.
regardless of posting status, written permission is required for certain activities such as driving and camping on private land.
Because ultimately, that's what I have here. I can just park off of the side of the road so long as it isn't blocking anyone and go off into the woods. I can do that and camp. Or sleep in the car, even. Without being worried about any trouble whatsoever. I can do this hours away from home without needing to know who owns the land.
Indiana doesn't need signs: If a local cop sees your out-of-town plates parked by the road or sees you in someone else's woods, they are going to ask about it. Lots of folks don't care all that much, however, especially if you aren't camping or hunting, so if they see you, they might say hi but that's about it. (Parents had some acres of woods, and didn't care with the exception of hunters - they wanted to know when hunters were about so they didn't let kids or dogs in the woods without proper safety colors).
You can't camp without permission although as children we certainly did this on our neighbors land.
Provided that the landowner does not charge a fee, a landowner is not liable for property damage or personal injury for the recreational use of their property.
I personally love it and would probably never post my land, but I feel like it is one of those nice things that can be described as "just the way we did things back then" that won't last much longer.
A quote from my states website
The landowner may maintain signs that:
Prohibit hunting, fishing or trapping;
Prohibit any combination of the three; or
State all or any combination of the three are allowed
by Permission Only.
Once registered, Permission Only signs and standard Posted signs are essentially
identical in meaning and enforcement. However, if you've decided to post, consider
Permission Only signs when:
Your primary goal is to know who is using your property;
You welcome hunters, but have had issues with other users;
You've made the decision to post, but want to show you support hunting and use
hunting as a tool on your property; and
You want to continue to allow other public access without written permission, such
as hiking and cross country skiing.It still happens though that as rural towns become more like exurbs though that new landowners post their properties to prohibit "traditional" uses that long-time residents had been doing all their lives.