I was running the UMR 2013 session again tonight, and I wondered about how some things are done in trainz when creating a route, not that I would have the talent or the patience to ever create any kind of route. What I wondered about is, how is the Ai car and truck traffic created? Does each vehicle have to be programmed to run on each and every road, because that seems like an impossible task. The other question, is that on this route, I see flocks of geese flying along very realistically ( first time I have seen that) . How is that done in Trainz?