Uniden IGO500 Owner's Manual page 108

To let the route fit your needs, you can also set which road types are to be
considered for or to be excluded from the route if possible.
Excluding a road type is a preference. It does not necessarily mean total
prohibition. If your destination can only be accessed using some of the excluded
road types, they will be used but only as much as necessary. In this case a
warning icon will be shown on the My Route screen, and the part of the route not
matching your preference will be displayed in a different colour on the map.
In the list of road types you can see in how many segments and what total length
of the road type is used in the current route.
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On-road navigation creates a turn by turn itinerary using the
road network on the map. Switch to off-road navigation to
navigate between destinations in a straight line.
The route calculation can be optimised for different situations
and vehicle types by changing the planning method. See
below for details.
If the selected routing method is not Green, you can have
your route compared to the best green alternative on the
screen when confirming the route. If this alternative is much
better than the selected method, you can quickly switch to
Green mode.
You might need to avoid motorways when you are driving a
slow car or you are towing another vehicle.
Charge roads are pay roads where you can purchase a pass
or vignette to use the road for a longer period of time. They
can be enabled or disabled separately from toll roads.
The software includes toll roads (pay roads where there is
a per-use charge) in the routes by default. If you disable toll
roads, your software plans the best toll-free route.
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