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There are more and more vehicles with reinforced glass windows (e.g. Porsche, Volvo, and soon the Tesla Cybertruck).

How can a firefighter break into the vehicle to save someone, if the glass is too strong?

All these reinforced windows are more meant to take the brunt of blunt force impacts. We have tools already to puncture laminate glass and simply cut out a section of the window for patient access. Unless they start designing these things to resist sharp metal objects at high velocity and saw blades, you don't have to worry about it.

Hydraulic claws will puncture into anything, including reinforced glass IIRC.

Now for sure it could slow down a rescue operation.

The simple specialized sledgehammer for firefighters (i forgot the name) might be hard to use on this glass. Also for non firefighters, rescuing someone trapped inside might be a challenge.

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