Then it's already covered by existing laws, isn't it?
I think they mean the STOP sign ON THE BUS. I understand (sort of) your sarcasm here, but the point of the legislation is to make penalties tougher on people who pass stopped school busses, who have the lights flashing and the stop sign out. Kids coming off these busses cannot see around them and if some idiot goes whizzing by one with a child coming around it, they are killed more than likely.
Frankly, I have NO problem with this whatsoever. Like someone else said, if you can't see the lights and big stop sign on a school bus stopped to pick up or let off a kid, you don't belong on the road.
The law that is being modified is the existing law that fixes penalties for running the school bus stop sign. This must be differentiated in the law from static signs because of sleazy lowlifes who will argue that the stop sign on a bus is not the regulation size, shape, etc. listed in other statues (see the point about bus lettering in the article).
So your point is stupid. This is the law that makes a school bus' lights and signs the equivalent of a stop sign. The only change is to the charge for running it...