What to do till the experts get there
If you find that your windshield has chipped or has incurred a crack somehow, then the first thing that you should do in order to keep your windshield and the rest of your car safe is of course to Call the auto glass repair company. However, till they can get their hands on your car and repair the windshield, there are a few things that you should do and not do to keep your windshield away from further damage.
You need to be careful for instance of dirt and grime. If dirt gets between the crack or the chip on the windshield it can actually make the job of repairing the crack even harder. So the best thing to do would be to simply put on some clear tape on the crack or the chip to make sure that it remains protected from dirt.
You also need to keep the windshield away from direct sunlight as that could cause the crack to widen and could lead to further damaging of the windshield. It would be best that you always park in shade or use some kind of a protective covering while the crack is still present on the windshield and until it is repaired.