Every law will have its proponents and those who disagree. This law was designed to help ensure the safety of emergency workers as well as the general public. I work in the emergency services in the streets of San Francisco and its truly amazing to witness the speed and recklessness of drivers around an accident or other emergency scene especially during rush hour traffic.
This is a very graphic video of what goes on at an emergency scene. Can you imagine someone going 65mph crashing into the original accident making the already bad situation worse than the original? It happens more often than you think.
Anyways, I'm in the process of buying a Superformance Cobra!
http://www.youtube.com/watch?v=R0LCmStIw9E