Comment by mrblampo

Yep this happened to me yesterday. In a taxi, the driver was following Google Maps, which showed a 22 min ETA, with one or two alternatives adding a minute or so. My phone was open and showed the same options. He felt certain that he knew a better route—via a highway, not a back road—and when he took that first rogue turn, Google Maps adjusted and the ETA instantly dropped to 14 min.