There's a lane near here that used to have a huge muddy pothole on the inside of a tight bend where lorry wheels dropped off the edge of the tarmac. It was perpetually full of water, so that whenever a truck came by, the wheels would drop into it and heave several gallons of liquid mud out all over the road, turning the bend into a skid pan. It was like that, getting bigger and bigger, for donkeys years before they filled it in.
There's another road in town that's used by the public, but was privately owned by a company that didn't have the funds to maintain it, and that had huge potholes in it for decades until it was eventually adopted as a public road, and rebuilt. Fortunately there was room for cars to pick their way between them.