There is only value if they are moving. There is value in moving out of the way of a moving ambulance or police car so that they can get to where they need to go unhindered by traffic. This is not the move over law. The move over law is about forcing drivers to change lanes in response to a STOPPED emergency vehicle, for "safety reasons". This is stupid because the stopped vehicle is to the front right, and if you make people change lanes you are making them instead focus on the rear left since now they have to check for oncoming traffic. So this law whose purpose is safety actually undermines safety.