A truck-restricted road, as determined by the controlling governmental authority, prohibits trucks larger than a certain size and weight. A truck-discouraged road is one that is open for local deliveries, but unsuitable for through trucks, as determined either by the controlling authority or by PC*MILER.
These roads can be seen on the map can by setting the Map tab > Map Features dialog with the Truck Restrictions checkbox.
In accordance with these regulations, PC*MILER does not use truck-restricted roads when routing vehicles larger or heavier than the restricted size or weight. PC*MILER 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 a very significant amount of time and distance to a route; or if you have marked the road to be favored.
However, you can override these restrictions using the Restriction Override feature described below. (This assumes that you have been granted permission to use these roads from the controlling authority, or that you are going to be using special equipment.)
Overriding Restricted Roads
You can override restrictions on a road by selecting the Tools menu > Toggle Overrides button and clicking the sections of restricted road you'd like to override in the map window. You can do the same thing from the map within the Avoid/Favor Manager, which can be reached in the Tools menu > Manager > Restriction Overrides. Be sure to override all segments included on the route; otherwise the entire road will continue to be treated as inaccessible. Overrides are indicated by a solid dark blue highlight.
IMPORTANT: Your avoid/favor preferences, including Toggle Overrides, will affect routing only when Routing Preferences > Custom Roads > Use Avoid/Favors is selected in the Route Options dialog or current route profile. This option is turned off by default.
Overriding Discouraged Roads
For a road that is flagged as “truck-discouraged” (versus “truck-restricted”), in addition to overriding the road, you must designate all the road segments on it as favored to make it fully truck-accessible.
Overriding All Restrictions
To set PC*MILER to override truck restrictions by default, click the Routes tab > Profiles and edit the Default route profile (or whichever profile you use regularly). In the Routing Preferences tab, set Restrictions to Override, then save your edit.
To undo an override, click on it on the map with the Toggle Overrides tool activated or delete it from the Restriction Overrides tab of the Avoid/Favor Manager. The road will be restored to its original truck-restricted status