Car question

[Bernard]

I've had my Hyundai for a couple years already and yesterday, while talking to my neightbor while we were standing next to the car, I noticed that the VIN was visible through the lower, driver's side of the windshield through a cutout. It's white lettering on a black background. I was shocked to see it, firstly because I'd never noticed it before, and secondly because I thought VINs were always on the inside of the door frame (and apparently a few other hidden areas).

So my question is, is there a legal requirement in the US for this windshield display to be visible? By extension, is it illegal to cover it up (not that I'm thinking of doing so)? I can't find anything online, apart from UK conversations that say it must be visible.

[Mik]

Mine have always been visible there. They put them several places, presumably to make them hard to remove or change.

[AdagioM]

My Subaru has it in both places, too. Maybe more!

[Daniel.]

It's most probably federal law that's it's visible. I can't remember a car except my '64 Beetle that didn't have it. I always assumed it was for law enforcement reasons.