Nitpick: Moving your eyes to look at a speedometer is a conscious muscle movement, not a saccade. Saccades are involuntary, automatic and not consciously felt; they're the sensory system's way of automatically building up the visual "scene" in your brain from multiple images even though you feel like your gaze is fixed on a single point. You can't focus on the road and read the speedometer from your peripheral vision.

In the back of my mind, I knew there was was a "this is not technically a saccade" situation but couldn't remember why. Thanks for the clarification.

Thanks for teaching me a new word! Saccade!

Yes, I do think it is worse, but that's just my gut feel, presumably Telsa designer's think otherwise. Not many other cars with the speed in the center console (older new-generation Minis come to mind though).

You might be in over your head with a guy who knows a word like saccade.

> Do you think a diagonal saccade is worse than a vertical one for some reason?

Yes, definitely. You don't?

Vertical movement is much easier, just try it. It's also easier to focus since one eye isn't farther away or blocked by your nose.

From experience: when tired, glancing down while driving is hard, while glancing sideways (at nav) is fine.