If there’s one certainty about autonomous vehicles, it’s that they’ll save lives . It’s the latter that concerns Ford CEO Mark Fields about the technology’s future success.

According to Inverse, Fields said at a recent panel decision with two New York City transportation officials that his biggest AV fear is that auto companies will move too quick and roll out self-driving cars too soon. From Inverse:

“The one fear I have is if anybody in this industry tries to jump the gun and maybe get a beta-test product out there that — God forbid — has an event, an accident or something, that’s going to cause people to pause,” Fields said at the Ford Mobility Summit, a panel discussion with two New York City Transportation officials.

Of course, the first self-driving car fatality already happened in Florida last year, when Tesla owner Joshua Brown . So it’s somewhat strange that Fields has raised alarm about something that’s going to happen, and indeed will happen again.

When Joshua Brown was killed last summer after his Tesla Model S in Autopilot mode crashed into a…

Now, Fields isn’t staking out a stance akin to Tesla founder Elon Musk, who equated . But it emphasizes what’s an obvious point: As it stands, a majority of drivers , and we’re that’s needed to support the technology.

So while Ford has ambitions to roll out self-driving cars to the public within the next decade, Fields’ remarks inadvertently reinforced that we have no idea what’s to come of AV technology in the coming years, and it’ll than anyone now expects.