What is the difference between a truck-restricted road and a truck-discouraged road in eMILER?

A truck-restricted road, as determined by the controlling governmental authority, prohibits most kinds of truck use. Such a road is highlighted with a thick yellow line in the eMILER map window. In accordance with these regulations, eMILER does not use truck-restricted roads when routing.

A truck-discouraged road is one that is not very compatible with truck use, as determined by eMILER. The road may be discouraged because it is winding, or not well paved, or for a variety of other reasons. This type of road is usually drawn as a thin yellow line in the eMILER map window. eMILER avoids routing over truck-discouraged roads whenever possible, with the following exceptions:

• If the destination is located on such a road.
  
• If avoiding the truck-discouraged road will add significant time and distance to a route.