Because the traffic isn't known to you but it is to Google. I could take two routes, one is faster depending on circumstances, and Google knows those circumstances.
Is it really faster though?
All you have now is two routes with a roughly equal amount of traffic on.
One of those routes will be a massive detour.
Is it really faster though?
All you have now is two routes with a roughly equal amount of traffic on.
One of those routes will be a massive detour.