Waze claims to do something like and it produces the most retardedly slow routes ever. I just hate it when someone uses Waze on my Lyft because I just know I'll take 10 minutes more.
I don't think it's as trivial because there are lots of things to consider. Some drivers are just SLOW and it will have nothing to do with traffic. Maybe all slow/terrible drivers use your app so all the route speed information is completely based on specific patterns set by your app.
That is odd in my experience. Perhaps it has to do with my locale.
I am in a major metropolis and I drive throughout the city, suburbs and adjacent cities regularly. I know the area and I have been driving for decades.
I have been using Waze for about a year now. The navigation routes it selects appear to be very good. They appear to be based on relevant factors too. I can only guess what variables they include in their calculation, such as weighted capacity, current traffic speed, etc. of the relevant route elements.
I don't think it's as trivial because there are lots of things to consider. Some drivers are just SLOW and it will have nothing to do with traffic. Maybe all slow/terrible drivers use your app so all the route speed information is completely based on specific patterns set by your app.