in any event, moving on from the pontiac trail stupidity, here's a census 2020 tract density map of SE michigan that clearly shows ann arbor is much more developmentally connected to metro detroit along the I-94 corridor than toledo, flint, or port huron are along their respective interstate corridors.
As I said earlier, Ann Arbor is in a gray zone. It's a bit of a bubble off on its own, but it's also still tenuously connected by corridor development to the nearby metropolis. It's not fully engulfed like Pontiac, nor is it fully stand alone like Flint or Port Huron.
