All roads that I know of around here are 4 rod roads, so 33 feet to the center of the road. Center of the road means just what it says, CENTER OF THE ROAD.
All my deeds say the same thing on distances in regards to land..."more or less". That means the pin on the side of the road is about as arbitrary as it can be.
If I am mowing, and I am only out 18 feet from the edge of the road (3 passes with a 6 foot mower), good luck complaining to someone. 18 feet back is not that far, and to NOT mow back causes safety concerns. No Judge in the country is going to side with ONE landowner when mowing is for the good of the community.
I get complaints all the time, get yelled at just as often, get flipped off, get cars parked in front of me, whatever. I get yelled if I mow back too far, and yelled if I do not mow back far enough. A boom mower operator has to have thick skin. People love to complain, and that is fine, bring it up with your town selectmen, I have a job to do, and do not have time to listen to you run your mouth. If I listened to everyone whine, I would never get my job done.