If you are going to go breaking glass with people inside, please keep in mind that side and rear windows are tempered glass, which breaks easily with any pointed object, and while the little bitty pieces of glass that result will cut you, but not too badly. Windshields, on the other hand, are hard to break, and make a jillion little shards of glass that will get into eyes, ears, lungs, all kinds of bad places. And glass, when it gets into an open wound, is very hard for doctors to locate and remove, and does not show up on x-rays. So you MUST cover the victim with something (plastic "body blankets" that most highway cops carry work pretty well), and you have to be very careful when you remove the blanket, those little pieces of glass will go everywhere...
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OBG