DETROIT — Testing by AAA shows that electronic driver-assist systems on the road today may not keep vehicles in their lanes or spot stationary objects in time to avoid a crash.

What do you do when your CEO confesses that he’s cracking under the stress of his job? That’s the question that the nine board members of electric car and solar panel maker Tesla Inc. must answer after Elon Musk, the company’s impulsive leader, admitted to The New York Times that work is rattling his nerves in what he described as the most “difficult and painful year of my career.”

Electric car maker Tesla Inc. burned through $739.5 million in cash last quarter, paving the way to a company record $717.5 million net loss as it cranked out more electric cars.

Ride-hailing company Lyft is joining with large Canadian auto parts supplier Magna to develop self-driving vehicles, sharing expenses on a multi-year project that could vault them onto the leader board in autonomous technology.