Saw this today in an e-mail from a towing newsletter.
http://www.moveoveramerica.com/
There is a law in every state but Hawaii and Washington DC that you must move over(change lanes if possible) if an emergency vehicle is stopped with his lights on. This includes tow trucks and Maint. vehicles. If it's a 2 lane road you have to slow down to 20 mph. Pretty good read, I know it's posted in Idaho on the highways but never knew it was in all most all states. Hope this keeps em safe and you without a ticket.
Terry