Where I'm from 1000 ft is your average driveway. There are some private roads but they usually have an informal arrangement on maintenance that is equal split.
We have a shared driveway with our neighbour only about 500 ft though, we have a deeded right of way on her driveway. She's a nice person, I plow the snow for nothing and grade it as I have the equipment. She lets me park stuff like my disc mower in her barn for the winter. I suspect if she ever sells we may offer to sell out our access and put a new road in just to be good neighbours. If the new folks are nice it would help to have a driveway twice as wide anyways, semi trucks hate our entrance now.