The windshield is what is looked through. Lights just assist in viewing. Putting eyes in the headlights would be weird.
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The creators of the movie "Cars" probably had some very heated debates about whether the vehicle eyes should be the headlights or the windshields | Spyke
The makers actually call this out in Cars 2: https://pixar.fandom.com/wiki/Cars_2_Trivia?file=Lights.png
Omg now it finally makes sense to me why was Matter so freaked out! I was always like "Huh? She just said Headlights"
That is actually a direct reference to the cars made for Chevron commercials by Aardman Animations (Wallace and Gromit, Chicken Run, Shaun the Sheep, etc.) starting in 1995.
Okay, let's assume that the windshields are the vehicle eyes, what are headlights then? Dimples they can make glow at will?
EDIT: Oh, wait, never mind. I just outed myself as not having seen the movies, lol!
The windshield is what is looked through. Lights just assist in viewing. Putting eyes in the headlights would be weird.