They are down a right of way, which was originally 2 separately maintained driveways, but then through a joint agreement with the neighbor, they had the driveways replaced with a single "slab" of concrete, effectively making it a double lane driveway.
To run a cable from the road to my folks is easy as there is a strip (approx 2ft wide) of soil which (using common sense) could be dug up with no hassles, and only part of the concrete in front of the garage that would have to potentially be dug up is firmly on my parents property.
Would consent still be required from the neighbors sharing the driveway ? I'd assume not as legally it is two separate drives etc and an install wouldnt interfere with the neighbor at all.... but after seeing some horror stories etc about shared drive consents etc.... yeah well....
(Just to clarify, driveway is "shared" between 99 and 101)

TIA