Chips in car windshields can spread for several reasons, like temperature changes, vibrations, and getting wet. When a windshield gets chipped, it becomes weaker, and any pressure can make the chip grow. If it gets hot or cold, the glass changes size and puts pressure on the chip. Also, driving on bumpy roads or over potholes can make the chip grow, as can water from rain or washing the car.

The location of the chip can also make a difference. Chips near the edge of the windshield or where the driver looks are more likely to get bigger because those areas have more stress.

If your windshield has a chip, fixing it quickly before it worsens and causes more damage is good.