Your route may use a particular road that you would prefer to avoid. There are two ways you can do this:
Tap on the map to avoid a road.
Tap the road you wish to avoid, and then tap the blue arrow next to the road description.
Select Avoid This Road.
Avoid a road from the Navigation screen.
Tap the arrow at the bottom of the map to display the navigation screen.
Tap on the road you wish to avoid.
Tap on Yes.