Why is there a crack inside the windshield but not outside?

[OPhoebe]

If there is a crack inside the windshield but not outside, it may be caused by thermal expansion and contraction cracks or damage from external pressure. Additional information: Windshield wipers are one of the main sources of damage to the front windshield. On one hand, after prolonged use, aging wipers can cause damage - if the end of the wiper arm directly rubs against the windshield, it will not only fail to clean rainwater effectively but also scratch the glass. Moreover, wipers that accumulate dust can easily leave small scratches and fine marks on the windshield when rubbing against it. Experts point out that at high speeds, even these tiny scratches can lead to windshield breakage. Although the probability is small, some cases of sudden windshield shattering on highways without an apparent cause are actually the result of these accumulated minor scratches over time.