Alabama Code § 32-5-200 governs windshield condition:
(a) It is unlawful to operate a vehicle on a public highway with a windshield that has cracks, breaks, or defects interfering with the driver’s clear vision.
(b) A crack/break is not a violation if repaired per standards set by the Alabama Department of Public Safety.
(c) Violation is a Class C misdemeanor (max. $500 fine, no jail).
Bottom line: If a crack blocks your view, it’s illegal. Fix it promptly—it’s cheaper than a ticket or a crash.