Scenario when driving on dirt roads..?!?!?!???? when can anyone get over it?

Hi, I have a question. there is a dirt road.. this one is equipped with a prohibition sign for cars and motorbikes. on this dirt road there is a “pair” garden owner with fruit trees. Who can now drive with what on this dirt road. Can one drive with a car <3,5T on it if: 1. one property sitter is this adjacent to the dirt road? 2. one e.g. at a farm around the corner of the "skillier" through the dirt road to reach animals is accommodated (e.g. horse e) but not belonging to a farm. and now the same question on >3,5T… e.g. 7,5ton.. My opinion can only be someone up there if he has a green area which is only accessible through this dirt road and or has a tractor under the back. thank you already!