A recent update must have broken something, because this mod worked perfectly fine until the end of December. Now, whenever I upgrade a road to a different type, or connect a new road to an existing road, or even try to make a new network entirely (ie, a monorail), it completely breaks the network. All vehicles trying to travel that network disappear, any that don't will get stuck upon touching the offending piece, and pathing just otherwise doesn't work (ie, placing a bus line). Also, nothing I do with this mod affects traffic. They'll just ignore any lane markers or intersection rules, like I never put them down at all.

UNTIL I restart the game. Then whatever I did comes into effect properly.
It's a huge pain to have to restart the game every time I modify a network.

I know it's this mod because I unsubscribed to my mods one at a time and when I got to this one, the issue magically disappeared. Resubscribing brought the issue back.

If there's any more information I can provide that would help get this fixed, I'll gladly give it. This isn't the most highly rated mod for no reason, and I don't want to play the game without it! But this is a bug that's hard to live with.