Derived from 'cattle grid', a gridder is a person who lives on the more rural side of a road with a cattle grid. Someone who has one on their road and in front of their house is known as a 'double gridder'. It can also be applied to those who have to go over cattle grids in order to reach work. (Originated Hythe, Hampshire)
"Where do you live?"
"Oh you're such a gridder."