WASHINGTON (WUSA9) -- More than 150 police officers in the U.S. have been killed since 1999 after being struck by cars along a highway.

The Move Over Law requires drivers to move over and change lanes or slow down to give safe clearance and protect emergency responders. Forty-nine states have passed move over laws.

For more information on Move over laws, go to http://www.moveoveramerica.com/

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