My (limited) understanding is that a Level-3 system will sound an alarm, and tell you take control, if it sees something unexpected, such as a truck stopped in

My (limited) understanding is that a Level-3 system will sound an alarm, and tell you take control, if it sees something unexpected, such as a truck stopped in the middle of the highway ahead. Whereas the Tesla expects you, rather than the system, to monitor roadway conditions ahead and decide whether to take control.