ANNAPOLIS, Md. (AP) — Maryland State Police officials are urging motorists to be mindful of a law that requires they move over when police officers and emergency crews are working along roadways.

The so-called move-over law is intended to provide an extra barrier of safety for police officers, firefighters, and emergency rescue personnel. The public awareness campaign comes after two incidents in January in which Maryland law enforcement officers were injured.

A decal that references the importance of moving over will be displayed on patrol vehicles of first responders for one month.

Violating the move-over law can result in hefty fines, especially if the violation results in someone being injured.

State police say more than 150 law enforcement officers have been killed in the U.S. since 1999 after being struck by vehicles along highways.

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