The fact remains undisputable that the OP's neighbour can park in either their drive or on the public road. What part of that cant you grasp?
I grasp it perfectly well, thank you. Please read my posts back. I am not, and have never, disputed the right of the driveway owner to park on the road.
What I am asking you is very simple:
You can park in space A or space B.
OP can only park in space B.
Which is the most efficient way to park two cars?
The relevance is, of course, that the correct answer - the one that maximises efficiency - is for you to park in space A and for the OP to park in space B. Bingo, both cars are parked in spaces.
But you won't answer that because when you do so, you will be acknowledging that maintaining your right (and it is a right) to park in space B is not the most efficient way to park or to work to a solution that best fits both people.
And acknowledging that means acknowledging that you're an arsehole
because only arseholes deliberately and openly seek to be obstructive, to reduce the efficiency of a goodwill system.
But you don't care. Your neighbours are welcome to go fuck themselves.