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The default setting in iGuidance is Quickest. This is the only setting I trust. iGuidance generates quite good routes, but in my experience only when the Quickest setting is selected.
The Shortest may occasionally help on a very short trip. But make sure you zoom-out, to check if the plotted route is really how you wish to travel.
The Local and Major DO NOT work as advertised - at least not in my city. Be very careful when you use either of the two settings, because the route generated may be quite bizarre - adding miles and miles to your trip.
* Quickest = good
* Shortest, Major, Local = use with extreme caution
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