California, United States of America
The following excerpt is from People v. McThrow, F069434 (Cal. App. 2015):
Significantly, even something as thin as a crack in a windshield may provide reasonable cause to stop a vehicle on the ground that a Vehicle Code violation was occurring. (See 26710 ["It is unlawful to operate any motor vehicle upon a highway when the windshield or rear window is in such a defective condition as to impair the driver's vision either to the front or rear"]; see also People v. Superior Court (1968) 266 Cal.App.2d 685, 689-690 [finding that a cracked windshield may impair visibility and officer leaning into vehicle to inspect the crack was reasonable].)
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