Transportation
When being transported, handguns must be unloaded and in a locked fully enclosed container other than the glove box or any console attached to the vehicle. The trunk of a car is considered to be a locked container but a glove box or "utility box" is specifically forbidden. If one believes he or she is within a "gun-free school zone" (area surrounding 1,000 feet from the edge of school grounds which teaches any grade from kindergarten to 12th grade) then the handgun must be locked in a fully enclosed container. Failure to lock up a handgun while in a school zone is a violation of federal and state law.
Long guns (rifles, shotguns) must be unloaded when transported in a vehicle. There is no requirement for a locked container with the exception of long guns considered to be "assault weapons". Federal law requires locking containers when inside of a "gun-free school zone." The constitutionality of the federal Gun-Free School Zone Act is in question due to the U.S. v. Lopez ruling.
Assault weapons, as defined by California law, must always be transported in locked containers and may only be transported under certain circumstances.
Read more about this topic: Gun Laws In California