> * The suburbs need more public transit than you think they'll need. Once you hit 50k people or so, you'll be hurting for transit badly. "But I'm building low-density housing with a street hierarchy, it works fine in real life, so why are my roads clogged in the game?" Yeah but in real life you're not cramming a dozen people into every single-family home.

One could argue some cities have low-density housing next to transit though (like Berlin, or Paris). It does have the disadvantage of making metros too easy though, so commuter rail is almost never done because it is too hard to integrate to a city.