At CES earlier this January, Mercedes announced that it would become the first car company to achieve certification from the SAE for a Level 3 driver assist system. That became official on Thursday when the automaker confirmed its Drive Pilot ADAS (automated driver assist system) now complies with the requirements of Nevada Chapter 482A, which governs the use of autonomous vehicle technology on the state's roads. That makes Drive Pilot the only legal Level 3 system in the US for the moment.