Originally Posted by eubi
Here is CA law, edited by me for brevity:
27400. No person operating any motor vehicle or bicycle shall wear any headset covering, or any earplugs in, both ears. The prohibition does not apply to any of the following:
(a) Persons operating authorized emergency vehicles.
(b) Any person engaged in the operation of construction equipment.
(c) Any person engaged in the operation of refuse collection.
(d) Any person wearing personal hearing protectors in the form of custom earplugs that are designed to attenuate injurious noise levels. The custom plugs or molds shall be designed in a manner so as to not inhibit the wearer's ability to hear a siren or horn from an emergency vehicle or a horn from another motor vehicle.
(e) Any person using a prosthetic device which aids the hard of hearing.
Try again. This law refers to hearing protection devices. Such as the mickey mouse ear protection you see people wearing near airplanes or the type of earplugs you push into your ears.
It does not apply to radio or music headphones.
Chris