Mercedes' version requires the driver's hand to be on the wheel during steering. If not detected within 14 seconds it is disabled. Tesla's version (despite thei

Mercedes' version requires the driver's hand to be on the wheel during steering. If not detected within 14 seconds it is disabled. Tesla's version (despite their CYA language) requires no hands on the wheel, UNLESS the system loses sight of road lines OR a tracking car in front. In addition the Mercedes' system can't change lines automatically.