Tesla faces regulator scrutiny over 'Elon mode'

The National Highway Traffic Safety Administration wants to know whether Tesla (TSLA) made it easier for drivers using its Autopilot system to take their hands off the wheel. The mode is know colloquially as "Elon mode." According to the NHTSA website, Tesla did confidentially respond to the agency. Yahoo Finance Autos Reporter Pras Subramanian breaks down the story.