The state of Maryland has passed a new traffic law which states that a driver is required to move over a lane when passing a stopped emergency vehicle. This means that if for example: A police officer is on the far right lane and is flashing its lights, every motorist in the far right lane should move one lane to the left, if not they can and will be ticketed. It is referred to as the "Move Over Law" and it is intended to provide police and other emergency responders a bit more of a safety margin when they're at work on highways and major roadways. This law in particular took effect in Maryland in 2010, but many drivers are unaware and therefore being ticketed for this infraction. As for Virginia, the law took effect in 2002 and the District of Columbia has yet to implement such a law.
In Maryland the exact language of the law is the following:
"Drivers approaching an emergency vehicle using signals while stopped on a highway are required to make a lane change, if possible, into an available lane not immediately adjacent to the emergency vehicle. If mobbing to another lane is unsafe, the driver must slow to a "reasonable and prudent speed, given the current conditions on the highway."
Emergency vehicles are considered to be those operated by law enforcement agencies, vehicles of rescue squads and fire departments, Maryland emergency medical services, state vehicles responding to oil or hazardous material spills and ambulances of all types. As of October 1, 2014, this law will also include tow trucks.
The violation is considered a primary offense. This means that you do not have to be doing anything else illegal to be stopped by police. The fine is $110 and one point on a driver's license. However; if the violation contributes to an automobile accident, the fine increases to $150 and three points. If however the violation contributes to a fatal automobile accident or one where there is a serious injury, the fine is $750 and three points on a driver's license.