Give a user a notice when Waze is set to avoid tolls. Many times I have been on back roads wondering when I will get to a highway and come to realize that the option to "Avoid Tolls" is on.

Solution:
When the trip starts, let the user know what option is set.
Or have the toll status displayed on the screen "Toll Roads" / "Avoid Toll Roads". Also allow the user to choose if the status is to be displayed or not.