Cadillac 2005 XLR Owner's Manual page 226

Route Setting
This feature allows you to display and change the
planning methods used each time you plan a route. With
planning method options, you are able to select the
fastest route based on time or distance, using only major
roads, toll roads, and using ferries based on the
navigation system's information and information
contained on the map DVD.
The following options will be available from the ROUTE
SETTING menu:
Minimize Time/Distance: The system will calculate the
fastest route or shortest route possible. Choose Time
for the fastest route or Dist for the shortest route.
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Use Major Roads: Choose Yes to calculate the best
route using only major roads unless a route cannot
be found without the use of a secondary road.
This selection will not always offer the shortest distance
or time to your destination.
Use Toll Roads: Choose Yes to calculate the best
route using toll roads wherever possible. This selection
will not always offer the shortest distance or time to
your destination.
Use Ferries: Choose Yes to calculate the best route
using ferries when possible. This selection will not
always offer the shortest distance or time to your
destination.