So  no answers huh?

So far as I know it depends where you are.  If you in an area that the Agents Rurals consider holy then you can't sneeze without them saying it's OK. And they probably will say don't sneeze! 

If on the other hand these trees are blocking access to a dwelling which is legal to occupy then why shouldn't you cut them out?  Once you ask question from authorities then you have to comply with their answers, but do what you think is sensible and do not talk about it.  If you are not occupying legally then what the heck?  You are illegal.  Do it anyway.