The XT gives an annoying audible ding and cuts off intercom etc whenever you are about to enter a different speed zone. This will drive you nuts in a city. Other warnings such as school zones can be disabled but not this. Garmin have received complaints and had set up a case file on this. If they get enough calls they may redo the software. They currently they have 43 logged in the file and we need more people to call about this.