I am thinking of this for a while. Everyone has their personal favorite routes while driving or riding. Also, there might be a construction work going on some street that Google doesn't know. Introducing a new app or a special plug-in for the current maps app will help navigate better. Also according to the preference of certain roads/paths, Google could update their navigation route for everyone. Many features could to the navigation part of the maps like adding traffic lights, police barriers etc.
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