Before we deal with whether you can fix a cracked windshield or should just replace it, you should take note of why a windshield that is undamaged is important. The role of a windshield is to firstly protect the occupants of the car from wind, debris, dust, bugs, and the elements as you drive. It also helps to ensure you have a clear vision of the road ahead. But there is another important function: safety.Did you know that your car’s windshield provides up to 40% of the structural strength for your car’s roof? The support your windshield provides to prevent the roof caving or collapsing in a rollover is very important to overall safety – for this reason, it’s important to have a high-quality windshield that is structurally sound and undamaged.