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Just remember that car accidents can happen any time, to any one, so it helps to be prepared. A vehicle escape device typically includes the combination of a tempered glass breaking tool and a seat belt cutting blade. These tools can help you egress from a vehicle quickly in an accident that disables the doors and seizes the seatbelt. Note that window breakers come in two varieties: spring-loaded rams and pointed hammers. Choose the variety that suits your mobility and strength.
Just remember that not all windows in a modern car will be tempered glass, as laminates have become more common for durability. You can discern which windows are safe egress points by reading the visible factory markings on the glass. In modern sedans, for example, it's common to make the rear windshield tempered glass for escaping from a car sinking in water.