Encountered the ability to completely break the game if one uses a large road network on a custom island. The amount of road paths seems to be the critical factor, and is quite possibly related to the AI pathfinding. The errors are visible in various ways, for example standard BIS classes start giving RPT spams and visual model glitching.
Altis uses a roadnetwork that is a little bit over 700km long and consists of over 1400 paths, but it is unclear how large road networks the game supports at this time. A road network of 6000+ paths crashes the game.
While removing this limit outright by code changes would be much appreciated the next best thing would be some real parameters of what the engine can handle and what to look out for when making the new road network.