The Navigon App I use on the Iphone has some cool features. In the settings you can choose the type of vehicle to travel in and it will give different routes depending on what you choose. It gives you a choice between car, motorcycle, truck, bicycle and pedestrian modes.
It will also allow you to choose between the type of route you want. Optimum, fast, short and scenic. From there you can choose to allow, avoid or forbid highways, toll roads, ferries, residential streets, etc. It will also alert you to dirt roads along the route.
All in all its a pretty useful tool for travel and I have found it is more accurate than the other GPS units I've tried. It might be worth looking into.
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