Are you sure? Someone just did an interesting analysis (admittedly, very small data space but a long-term test), found that Waze claims faster routes than they typically achieve.
It's entirely possible you're right, but I don't see how on any individual trip you can assert any solution achieved the best time, unless you have 3 different drivers to take each proposed route (and even then, there's enough variability to make it suspect unless you do it over a long enough period of time).
Are you sure? Someone just did an interesting analysis (admittedly, very small data space but a long-term test), found that Waze claims faster routes than they typically achieve.
Update: Ah, @dogecoinbase linked to it: https://arturrr.com/2018/02/19/navigation-apps/