Avid Urban waze users like myself often find that our traffic reports will only cover a tiny segment of road, often only 100 or 200 ft. It seems this behavior has something to do with the way that the roads are segmented. There have been many times that I will be in traffic on an urban road in Chicago, report the traffic to help the community, and see that my report barely extends in front of and behind the icon of my vehicle. I'll either spam traffic reports every couple hundred feet while I'm in traffic to cover more length of road, or just give up and not bother.