Mercedes-Benz is the first to bring Level 3 automated driving to the US - The Verge

The company’s Drive Pilot system is approved for use in Nevada, but only at speeds up to 40 mph.

Level 3 systems are not without their risks. Most autonomous vehicle operators, including Waymo and Cruise, have said they think Level 3 is too dangerous, preferring to work exclusively on Level 4 technology. The reason is the need for drivers to stay attentive despite the vehicle performing most of the driving tasks.

There have been studies that show that hand-off between automated system and human driver can be especially fraught. When people have been disconnected from driving for a longer period of time, they may overreact when suddenly taking control in an emergency situation. They may overcorrect steering, brake too hard, or be unable to respond correctly because they hadn’t been paying attention.