The Navigation computer does not generate an expected Route Manoeuvre List?
Route generation is based on complex mathematical equations against weights given to roads. i.e. A Motorway is more likely to be used than a Highway even though the Motorway option may be a longer route. Try changing Shortest Distance/Shortest Time/Most Use of Freeways/Least Use of Freeways option for your preferred manoeuvre list (V9 switch off ‘Avoid all Toll ways’).
