I'm quoting this as a thank you, and as an emphasis to others who may be reading. because you still did not divide the three primary knife types. (Fixed blades, Folders and "Switch" Blades).
The 3" length limit applies to FIXED BLADES.
Fixed blades must be carried openly on the belt, and no other place on the body. LA puts the limit on fixed blade open carry at 3". CA, including LA, does not allow concealed carry of fixed blade knives, and by the same token, you may not carry a folder concealed while it is
locked open.
Folders, however, may be of ANY LENGTH so long as they follow these rules:
1) It's NOT A SWITCHBLADE, balisong or gravity knife. Meaning, it is not opened or operated by a button or lever that is not a part of the blade itself. There are a couple of other definitions, but this gets to the meat of the matter:
no flicking the thing open without touching a part of the blade itself. EDIT - the fact is, switchblades are actually legal UNDER 2". so you'll see all kinds of 1.9" keychain and other switchblade type knives sold here.)
2) It must be CONCEALED. If you can see a part of it, like a pocket clip or a handle, or it has a belt carry sheath, guess what, you are likely limited to 3". If you keep it inside your pocket or inside your jacket, if you keep it inside the flap or your bag instead of outside on the strap, you can carry pretty much any size folder. (Not that you'd want a monster 7" in the crotch of your pants.

)
3) It must remain CLOSED while on your person (unless you are actually using it in a reasonable and lawful manner).
So knowing all of this, know that spring assisted knives are A-OK so long as you follow the rules. Keep it hidden. "Unhide" it only when it NEEDS to be unhidden.
Here's an idea of sheer practicality: Don't whip your knife out to "impress" people, in which case, the type of knife is not really the issue anymore. That issue has changed to getting "crazy knife guy" off the street. Keep your knives out of view if you are in restaurants, bars, stores and any other public place where people can get freaked out. If you actually need to use a knife, well, go ahead. Just use the right kind of knife. Buddy of mine got in all kinds of hassle when he pulled out a push dagger to eat his steak at a fancy steak joint. His carry of the push dagger was perfectly legal. Hip sheath, not concealed, under 3", using it for preparing food at a dinner table. By law, he was
all good.
But that thing looked
evil (push daggers are designed for concealing and then stabbing people, after all) and it freaked out the waitress who called the police. DON'T LET THIS BE YOU.
Random closing: in my opinion, LA knife laws are extremely generous compared to other cities like Chicago and New York.