There is a good amount of incorrect information in this post. CCW availability varies by county but some counties are as big as some states. My county is one of the larger ones and they are issuing CCW permits
The issue with California is there really is no reason to use the "safe passage" act from saving your butt if your "driving through" the state, one part due to it's sheer size, and the other is you're either coming from Mexico on one heck of a long drive north, and if you're going west, you're going to hit the Paciffic ocean.
The other reality is even if your right and within your legal right to travel through a state with a firearm, doesn't mean they still can't arrest you and make your life a living heck.
I ALWAYS went out west with a gun. I would never be so stupid to be an out of state resident with a firearm in California, particularly with out of state plates.
No different than NY, Massachusetts, Jersey or Maryland.
Now Western Maryland is interesting, and perhaps like a little bit of California where we stayed when it comes to guns.
I do know when I went up 81 from NC to Pa, for that 15 minute drive through eastern Maryland I'd unholster everything, lock it up, then re holster when I got out of the state. Took longer storing and locking everything up and then getting everything out than the drive through the state took. That said, no way was I going to get into a car accident (not planning on being my fault LOL) and have a gun on my possession.