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All windows in an automobile are tempered glass only except the windshield which still is the laminated glass. The two sheets of glass that are laminated together are tempered glass. Tempered glass is heated to near ists melting point then quickly cooled by air jets. As we know when an article cools it shrinks. The surface cooling faster than the insides of a piece of glass places lots of strain on the surface which makes it resistant to shatter. We are all familar with the breaking of a standard single glazed house window. The broken pieces are like long knives and act that way. No one wants this in an auto or train which could kill or severely cut people. Tempered glass, due to its nature, will shatter into pieces no laeger than 1/4 inch which greatly minimizes the severe cutting potential. We have all seen the reminants of a broken car window at the scene of an accident. Household shower and patio doors are made of tempered glass to reduce the sutting risk. I have seen a demo where a patio door glass panel was placed between a couple of 4x4 boards. A person would stand on the glass and it would flex. Then he would chip the edge with a hatchet. The small chip in the glass released the internal energy and the pane would shatter to the 1/4 inch pieces.
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