Neither have I. Protecting Gorilla-glass with more Gorilla-glass always seemed like a pretty futile exercise to me.
McBryce.
Actually if stuck together with a non rigid adhesive it adds a lot of extra strength. That is why windshields and bulletproof glass are laminated.
Kind of. Car windscreens are mainly laminated to keep the glass together after it has shattered instead of having a wall of shards flying towards you if something breaks the windscreen.
McBryce.
It's both. They're stronger and large shards are kept captive. If it were just the shard protection, they'd be made of tempered glass that shatters into tiny grit like the side windows.
In many modern cars, the windshield(s) is/are actually part of the stiffness of the monocoque; it provides part of the roof crush support that used to be entirely provided by traditional A/B/C pillar design.
There was a lawsuit a decade or so back in which a replacement windshield popped out of a vehicle during an accident due to improper installation, and the roof of the vehicle collapsed breaking the driver's neck, when according to the manufacturer, it should have maintained integrity. Lots of investigation, enginerding, etc... but ultimately it was found that the windshield was cemented in place improperly, making the glass company liable.
mnem
Front windscreens are made of tempered glass and shatter in cubes just like the side glass, and although they do offer some physical strength / stiffness to the vehicle during a rollover, this factor is ignored in the mathematics because the pillars need to be able to support the weight of the vehicle even when all windows have failed. So it's a bonus, but not essential.
McBryce.
Umm, no. I've smashed enough windshields on my own and served on enough MVAs to know the first is categorically wrong. There are a million little splinters when a windshield is smashed. The side windows smash as you say, but not the windshield.
And the lawsuit in question says you're wrong on the latter as well. 
Not to be a dick, but just plain no.
mnem
Back in the day, toughened glass was common in windscreens.
When you were 1000 plus miles from home on a gravel road, the local taxi from a bush town just zoomed past spraying up high velocity rocks, & one hits your windscreen, the old toughened glass ones shattered into a zillion bits & became totally opaque.
You then had the options of punching the remains out, continuing to the bush town, then waiting till a new windscreen arrives, or just punching it out & driving al fresco the rest of the way home!
We did the latter, collecting plenty of insect varieties in our teeth on the way home, as well as red dirt.
When we got further south, it got pretty cold, too!
With a laminated screen, you might get away with just a chip in the outer layer, & at worst have several large cracks, but you will still be able to see through it, & avoid sharing the interior of your vehicle with various forms of flying wildlife.
An "on air personality" at one of the radio stations in Perth came up with an (obviously now dated), "Dad joke", which always remended me of this adventure.
Q: "How do you tell a happy motorcyclist?"
A: "By the grasshoppers in his teeth!"
The car magazines touted the other safety aspects of laminated screens, in that if your head hits a toughened screen in an accident, your skull does all the work of smashing the glass.
As you don't have a "toughened skull", you will come off worse in this encounter.
In the case of a laminated screen, it will crack more easily,but not shatter, your skull doesn't do as much work, & does not suffer as much damage.
Even in the worst case, the part of the screen you hit will bulge out, still reducing the damage
Anyhow, that is what they said!
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