> 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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