0,0 is a point in the Atlantic, off the coast of West Africa, where every missing coordinate goes to live. Its neighbours are the stops whose latitude and longitude were swapped, which land a continent away from the rest of their network.
The law
A stop within 1 km of 0,0, or a stop more than 2,000 km from the middle of the feed that would sit right next to it with latitude and longitude swapped back. Only stops served by a trip whose service still runs are judged.
How to get pardoned
Give every stop its real coordinates. If a stop has none, it should not be in stops.txt.