The short answer
A photograph or crack length alone cannot establish that a vehicle is safe or legal to drive. Arizona requires an adequate windshield and generally requires vehicle equipment to be in good working order and safe mechanical condition. The Arizona driver manual says vehicles must have a windshield without cracks, but the passenger-vehicle statutes do not provide a simple crack-length exception that makes a damaged windshield acceptable.
NHTSA identifies driver visibility, the chance of damage worsening during normal use, occupant retention and other vehicle-specific safety effects as relevant. Stop driving and arrange safer transportation if the windshield restricts your view, has loose or displaced glass, is rapidly cracking, interferes with the wipers, or appears unable to protect the cabin from weather or debris. A small stable chip outside the driver's view may present a different immediate concern, but it still deserves prompt evaluation. Do not apply the separate commercial-vehicle crack limits to a passenger car.
