I'm going to come as an ass by posting this but cant believe no one has said anything yet... And I am not trying to come off as a prick.. I've made mistakes in the past too and have been fined for being where I shouldn't have been.. Butwe all need to make an effort to keep places open and not add fuel to the anti-wheelers fire!
First off, if the property isn't posted and isn't listed anywhere as an ORV area, you shouldn't be there unless you talk to the land owner! Just because there aren't any signs, doesn't mean you can do whatever you like! And just because other people are there, doesn't give you the right to be there too! You have to get permission before you just just wander off onto a piece of land! City owned or privatley owned it doesn't matter.
This depends on the state. In PA all private and public property designated no tresspassing must be clearly marked every 100' by posted signs with the landowners name and contact information on it. This way should you want permission to go on the property you know who to contact. In addition I do not know about texas but in PA I have seen public roads in worse shape than private drives. How is a person to know if that turnoff is a back country road or someones driveway without signs.
Now this also requires a bit of common sense. If I see you doing doughnuts in a farmers field I'm gonna clock you in the head with an axehandle. but running a road you don't know just to see where it goes and getting fined for it...I'd fight it tooth and nail.
Another thing, did I read one of your posts correctly and you're running open headers? This just screams give me a ticket and draws attention to you anywhere you are. Not too mention its annoying to most people around you(not just wheelers but homeowners in the vicinity who can call the police). Not a smart move when wheeling. We get enough bad press as it is, dont fuel their fire. If you have an exhaust system, please disregard my last comment.
Now I do agree that the land shoud be posted in someway for no vehicle traffic, etc. And if there is a patrol person out in the area often, they should keep the signs up... Dont think having no sign is goign to get you out of a ticket, but at least rbing it to their attention. More than likely it is posted and someone pulled the sign and threw it off to the side.
And regarding your comments about removing the signs.. Come on... Grow up... Other people frequent these forums who aren't wheelers and are just looking for things like this to use against us.