In the State of Maryland law requires motorists to change lanes to avoid emergency vehicles and beginning Oct. 1 the law also covers any stopped vehicle showing warning signals.
Previously, Maryland drivers were required to move over for tow trucks, police cars and ambulances parked or stopped on a highway with flashing lights. A 2018 change to the law added a requirement to change lanes to avoid standing service vehicles.
After several similar incidents, the Department of Transportation and Federal Highway Association decided on a national standard in 2000. Over the next dozen years, all 50 states followed suit and instituted their own move over laws fine-tuned to their own specifications. And in July 2012, Hawaii became the final state to pass its own legislation.