[jedberg]

Not if the map is displayed in your field of vision. This is why airplanes have a display projected onto the glass.

I drove a Corvette with a heads up display once, and it was great not having to glance down at the gauges.

And also, you still have to glance down while driving to see how fast you're going, so clearly glancing off the road isn't that big of a deal.

[snowwrestler]

A HUD does steal from outward-facing attention. It's ok in aircraft because the forward environment for aircraft is far less cluttered than for a car. That's also why self-driving cars are so much harder to do well than self-flying aircraft.