Here in Florida, when the law rolled out, it was accompanied by a large advertising campaign, including a grace period in which warnings would be issued. California seems to have dispensed with these common sense provisions. I would take a ticket like that to court. I would also consider hiring an attorney who specializes in moving violations.
As a truck driver, I was trained to move over, when able, for any vehicle parked on the shoulder, so doing so for an emergency vehicle is an old habit. That kind of diligence pays off when some idiot pulls into traffic without first accelerating on the shoulder. Someone once committed suicide by pulling out in front of a semi from the shoulder on an interstate. Even though one of the kids in the car lived, and told authorities his father pulled out deliberately in front of the semi, the truck driver lost his case in court. The jury decided the professional driver should have been scanning ahead for hazards and acting accordingly. While I don’t agree with this ruling, it points out the value of avoiding collisions, regardless of who is at fault. We all know the kid’s father was at fault, the truth is, the professional driver still could have prevented the collision if he had been driving his truck as he was trained to drive it.
The “move over” law says something like if you can’t move over, slow down, but that oversimplifies how many states are enforcing this law. If you are on a two lane road in a no passing zone, or you can’t get over because of oncoming traffic, and you approach a stopped emergency vehicle, slow down (A LOT), since you can’t get over. If you are on a road with more than two lanes, or there is no opposing traffic, get over. Not being able to get over because there isn’t an opening isn’t going to get you very far in court since you will have to basically admit you weren’t paying attention to what was going on down the road in front of you. Even in my car, I can usually see the flashing lights from as much as a mile away, which is plenty of distance to find or make an opening to get over.
If, after trying to get over on a highway with more than two lanes, you find it impossible, you need to slow way down, enough to warrant using your hazard lights, and you better be able to make a good case that you tried to get over, but couldn’t.