Similar to giving an individual the first aid, there are some simple steps that you can apply on your broken windshield before you reach your professional auto glass replacement technician. It helps you reduce the damage extent and also could prevent you from having a full windshield replacement.
When a stone suddenly hits your windscreen leaving a crack, you should immediately look for the next exit and park somewhere safe. Before you start filling the break, you should clean the windshield using an auto glass cleaner and a paper towel; these are essentials that you should have. After that, you can apply a low-fidelity solution like super glue or clear nail polish, allow it to dry then place transparent tape on the area to prevent dirt till you reach your technician.
Another tool that you should carry with you is a windshield repair kit. These items are available in your local hardware and come in handy for windshield scratch repair. However, you will need to be hands-on and able to bore a small hole in the top layer of the glass using the drill bit. Later on, you can use the resin in the kit and force it into the hole. This should hold until you see a professional.
Also, you can avoid sudden temperature changes. Usually, glass expands in hot weather and contracts during cold ones. To prevent this from happening, park your car in the shade if possible till you get professional help. This should give you enough time to schedule a windshield repair with your technician to take over from the much you have done.