"Autosteer Speed Limited to ... ". Autopilot max speed is speed limit plus 5 mph.

[Peter Lucas]

On secondary roads, no autopilot if you want to go more than 5 mph over the speed limit. While that may sound prudent, the normal flow of traffic is often faster than this. Using autopilot should not require you to hold up traffic. Thus, autopilot has become nearly useless on secondary roads.
This seems like a new software feature. I have also had autopilot suddenly cut back my speed on interstate highways for no apparent reason. The usefulness and functionality of autopilot seems to be gradually cut back. Very disappointing.

Mosel S 90D, 2016.

 

[Tam]

...On secondary roads...

It's a balancing act between the freedom from censorship and safety cries from different groups such as NHTSA who said Tesla should have stricter geofencing rules which should have been applied to the freeway where the fatal 2016 Florida fatal autopilot occurred. That freeway median has a left turn lane.