In Boston, Waze and Google Maps will often suggest routes that are illegal, whether it's an NTT zone, a completely closed road, or no-left-turn violations.
I encourage you to sign up as a Waze route editor and submit an annotation to the segments of your routes that are illegal/invalid with photo evidence, both to improve the quality of their directions and to ensure that the Waze editors are not corrupting the dataset in order to get faster travel directions. If you find your edits overturned, write letters@lamag.com & btd@boston.gov — they will both very much want to know that Waze editors discouraged reporting of illegal routing!
