Nothing at grade, and certainly "felt" like a freeway!
Great idea about Houston; interesting results. I think they have a primary street addiction there
They do pop out better on the map, but given that Waze has said primary is not favored over street, is there a benefit?
Readability of the map, for now. That's the #1 reason to not get rid of all of the seemingly unnecessary street types. For the same reason why there are different color roads in an Atlas. If there are too many of any particular street type, they won't serve any purpose, but you should be able to judge from the size of the street, number of lanes, and the GPS tracks.
Just do the best you can with the data you have...it's still going to be better than unedited basemap. If the local Wazers go from their current frustration in not being able to route anywhere to a few minor annoyances that you couldn't figure out, maybe they'll be compelled to get in there and do some editing themselves.
I just hit a new outlying suburb of New Orleans that has never had a single segment edited, with the exception of a few spots where IGN editors tried
to fix update requests (there are about a hundred URs in this concentrated area). My only real knowledge of this area is along the highways and primaries, but I can tell you that right now, the whole area is un-navigable. I'm working with aerials that are probably from the summer, and GPS tracks that are about as good as anywhere. As of the next map update or two, Waze should operate there smoothly.
Once I clear out all the URs, any mistakes I've made should show up in new URs.