71 percent of Americans (including your humble correspondent) have never heard of "move over" laws and cheerfully violate them all the time. In effect in 40 states, the laws "require drivers approaching a police vehicle with flashing lights activated either to make an immediate lane change or to slow down at least 20 MPH under the posted speed limit." In Virginia, failing to "move over" can earn you a $2,500 fine.
"Our nation's law enforcement professionals put their lives on the line to protect our citizens," said Bill Johnson, executive director of the National Association of Police Organizations. "Slowing down and changing lanes to give our first responders the space they need to stay safe is the least we can do in return. It's what we must do. Move Over, America. It's the law."
Consider yourself warned.