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> Depends on your definition of "optimal". (E.g., total distance, verses
> estimated travel time, any tolls that have to be paid for certain routes,
> traffic volume, etc.)
On most systems I think you get to choose whether you want the shortest or
fastest route, the option to enable/disable motorways, tolls, ferries,
tunnels etc. Some systems even self-adjust the road weightings based on
your driving style. eg if you always drive at 220 km/hr on the autobahns it
will take this into account when calculating the routing.
The other thing that is cool, is that when it tells you to turn right in 1
km, it knows exactly which place names will be written on the roadsign, so
you can easy double-check that you are taking the correct turning.
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