It will be illegal to wear earbuds in both ears or headsets while driving a vehicle or riding a bicycle in the state of California. SB 491 does not apply to drivers in emergency vehicles or those drivers wearing covering for safety reasons.

It will also be against the law to ride an electric skateboard while under the influence of drugs or alcohol. AB 604 requires riders to be 16 years or older and helmeted. It also restricts use in some public places and on roads where speed limits are over 35 mph. A conviction for violating this law is punishable by a fine of up $250.

Source: http://www.nbclosangeles.com/news/california/New-California-DMV-Laws-for-2015-363392221.html