Keeping with the arrival time estimate, and I’m not sure if this answers your question

But I live in a very dense city (Chicago), it’s become almost “set your watch to it” reliable that not only are estimates more reliable from friends who live here when they say “I’ll be there in 8 minutes”, they’re also seemingly more likely to offer such a precise estimate because they know the area, light timings, and traffic patterns and that certain kind of behavior found among drivers in this city.

Compared to when I have friends from out of town renting a car they’ll tell me “GPS says we’ll be there in 10 minutes” I instinctively add another 10 and it’s never failed that they’ll show up and go “that was a long 10 minutes!” And I just smile.