I was noticing that Waze would not route from the Dallas North Tollway South onto I-35 as part of a longer route. It was determined that since the exit ramp from the DNT and the entrance ramp to I-35 are connected via a Service Road, this segment was being excluded from the routing unless it was within the first (or next) 10 miles of the trip. The following two threads document the discussion:
http://www.waze.com/forum/viewtopic.php?f=6&t=40813
http://www.waze.com/forum/viewtopic.php?f=8&t=40324&start=20
Based on the feedback there and the fact that Service Road is going away and all existing Service Roads will become Street. It appears the recommendation is that the frontage roads should become Primary Street or Minor Highway. I mention specifically I-35E since that is where I noticed the issue, but the same issue may exist along other highways. Since most of this area was worked over by other editors, I wanted to get a consensus on what we agree the roads should be set as. Just wanted to avoid making edits that someone else would modify later.