Driving over a speed bump, pothole or other uneven terrain can cause a chip to crack. The force radiates through the car and puts additional pressure on the edges of the chip, which can quickly lead to a crack.
Although it is not possible to suggest how long it will take for a chip to spread, the study suggest that stressors like weather changes and simple driving will eventually cause or lengthen a windshield crack.
Warm weather stress
Warm weather conditions cause windshields to chips to spread more vertically. The same study conducted by Motor Industry Research Association (MIRA) suggested that the heat itself distorts the shape of the windshield glass, which can lead to cracking by itself. However, it was also found that the cooling effect of the air conditioning unit is likely to set off a crack.
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