@boonedocks FWIW, I have seen the same behavior as
@DrtyJrze ... every once in a while, seemingly at random on the same road, I am able to get AP to set to over the speed limit on a regular non-divided road. I wish I could figure out the 'trick' - every time it happens I try to step back through how I got there. I do think it has something to do with being over the limit when you engage, but again, I can't get 100% reliable repro steps.
One thing I noticed is that when it does happen, if I dis/re-engage, i lose it. So once there, the trick it not to disengage as long as possible.
Clearly it's a bug that it allows it at all, but it does indeed occur.