Hm, I was always under the impression that it was random spawns, but perhaps not.

Even still though, they're going to drive in random patterns anyways, and it takes time to set up the trick, so the duped taxis wouldn't be spawning on anything that would flip them. Regardless, it's definitely worth testing out though, because who knows what weird nonsense this trick could break with that mission.

I assume this works for Jury Fury because it flips the duped cars. If that's the case, what's the likelihood of that being a consistent outcome? If it turns out to be consistent, I could see this being interesting for Taxi 2.

Though perhaps not, since the taxis would spawn in different patterns every time and would have no reason to flip.