This is a common question with many motorists. Chips and cracks on your car windshield can happen for a number of reasons. Edge cracks, stress cracks or floater cracks generally occur to automobiles that are a few years old. However, a chip on a windshield is a fairly common occurrence. This may happen when gravel, debris or a stone fling off the tires of the passing vehicles onto your windshield. Click through to find out how long you can drive with a cracked windshield before it sabotages your safety.