The mother of a New Jersey state trooper struck and killed by a car while on duty is educating the public about New Jersey's "Move over" law.

Donna Setaro says she believes that her son, Trooper Marc Castellano, would still be alive if more people were aware of the law.

"It became law in January 2009, and yet 15 percent of the population is aware of it," she says.

The law requires drivers to change lanes or slow down when approaching a stopped emergency vehicle. Trooper Castellano was struck and killed by a car while working a case along the side of Interstate 195 in Howell on June 6, 2010.

Setaro says it has now become her mission to educate New Jersey drivers about the law so that a similar tragedy doesn't happen again.

"The education is my No. 1 mission," she says. "It's not about the fines or even the tickets, but about spreading the word."

One way to educate is to get the Department of Transportation to install signs to warn drivers on New Jersey's highways to slow down or move when approaching emergency personnel.

Setaro also goes to schools to tell student drivers and their parents about the law. She says the law is now in the new driver's manual and on the state driving test.