For Gainesville Police Sgt. Justin Martin, traffic safety is more than just a paycheck. “It’s what I’m passionate about,” said the 30-year-old, “(especially) anytime you throw kids in the mix.” For his efforts in teaching courses to area law enforcement, Martin was named Safe Kids Gainesville/Hall County’s Tim Peebles Volunteer of the Year during a luncheon Tuesday at the Gainesville Civic Center.