They may vary, such as in the case of length or size of damage, but they all share a common denominator. “those drivers are on borrowed time before getting a ticket or the windshield gets worse,” said teresa o’mara, the owner of cal state auto and truck glass, a paso robles windshield repair service. California Hands-free Law Where To Mount Your Phone In Your Car These regulations permit cracks or chips smaller than ¾ inch in diameter, but they can’t be within three inches of another crack. Is it illegal to drive with a cracked windshield in california . If the crack interferes with your field of view, it is a greater safety risk and could get your ticketed. Here are some of the intricacies of dealing with both minor and serious damage to your vehicle’s windshield. It's not a violation per se of any kind with regard to your test. A crack can interfere with the driver's line of sight. However, it is a safety risk to drive your vehicle with a crack in the windshield...