Are helmets required for motorcycle riders in California?

Factual Questions
1

I was in California for the first time in many years. This was in Imperial and San Diego counties. Every motorcycle rider was wearing a helmet. Is this required only on freeways or is it required on every public street? Is the lane splitting still allowed?

2

Don’t know about the lane splitting. But you have to wear a motorcycle helmet no matter where you ride and no matter your age.
http://www.iihs.org/laws/HelmetUseCurrent.aspx

http://www.usff.com/hldl/frames/50state.html

http://www.amadirectlink.com/legisltn/laws.asp

3

IIRC from my MSF class, California is one of the few (only?) states that allows lane splitting.

4

Lane splitting is not prohibited in California

5

Helmets are required in California, even for outlaw bikers. You will get a ticket for not wearing one.

Lane splitting is allowed in California provided you do it safely. Whatever that means.

6

‘Don’t be a jerk.’