What the code requires
California Vehicle Code section 26710 requires that a windshield be in a condition that does not impair the driver’s vision through it. It does not publish a maximum crack length, which is why you get different answers from different people — there is no simple number to quote.
In practice, enforcement turns on the driver’s field of vision. Damage in the area swept by the driver’s side wiper, at eye level, is the damage that gets cited. The same crack low on the passenger side generally does not.
It is normally a fix-it ticket
Like illegal tint, a cracked windshield is usually written as a correctable violation. Get it repaired or replaced, have the correction signed off, pay the dismissal fee, and the citation goes away. It costs you a morning rather than a large fine.
The bigger reason to fix it
The citation is the least of it. A cracked windshield has lost a meaningful part of the structural contribution it makes to the roof in a rollover, and a crack across the passenger airbag’s deployment area means the glass may not hold when the bag hits it.
There is also a practical one that people underestimate: a crack scatters light. Driving west on Highway 50 at six in the evening with a crack across the driver’s side is genuinely harder than doing it with clean glass, and that is a daily safety cost long before anyone pulls you over.
What about the smog check?
California’s smog inspection is an emissions test and does not include a windshield inspection, so a crack will not fail a smog check. That surprises people, and it is why the fix-it ticket exists as a separate mechanism.
Need this done rather than explained? There is no shop to drive to. We come to wherever your car already is — your driveway, your workplace car park, an apartment lot, or the side of the road it stopped on — anywhere in greater Sacramento, with no call-out fee and no mileage charge. Give us the year, make and model and you will have a firm price before the call ends.