Gov. Charlie Crist has signed a bill into law that allows Florida residents to keep guns locked in their cars at work.

The bill says businesses cannot prohibit employees or customers from keeping a legally owned gun locked inside their cars, as long as the owner has a permit to carry a concealed weapon.

Some sites — schools, prisons, nuclear power plants, military facilities and buildings that store explosives — would still be off limits.

The governor signed the bill Tuesday.