Okay, took some video while driving on 2018.21.9.
The car used to go on offramps and interchanges at full speed or whatever speed limit you set, but it would slow as it entered any tight curves in order to be able to make the turn.
Now the car slows as it's exiting the highway even when there are no curves, making for a much smoother transition off the highway. It's probably using GPS to know when it's on an offramp. GPS isn't always accurate though, and I noticed the car would occasionally slow down temporarily on the highway, probably thinking it was actually on an offramp when it wasn't.