A hidden Tesla feature nicknamed 'Elon mode' is under scrutiny from regulators after a hacker discovered a way to get rid of a prompt to drivers to keep their hands on the wheel

• Auto regulators ordered Tesla to hand over data about a hidden Autopilot mode that lets drivers stay hands-free.
• It reportedly removes a prompt telling drivers to put their hands on the wheel, and was discovered by a software hacker.
• The letter was made public days after Elon Musk livestreamed himself driving while using his phone.

The National Highway Traffic Safety Administration says Tesla has an Autopilot mode that lets drivers go hands-free for an extended period of time, and has ordered the company to hand over data about it, Bloomberg first reported.