When traffic is building up while driving on the road, Waze will zoom out suggest a new route... And do nothing. No countdown to reply before it cancels and goes back to not mal navigation, nothing. It just sits there with the suggestion to either change route or go back to current route, and the driver has to press whichever button else you get no navigation with the blocked suggestion screen on top.
This is a road hazard as the driver is forced to choose something to continue, and imagine when it keeps suggesting route changes every few minutes.