The Iditarod Trail Committee board of directors approved the two-way communication rule after a man riding a snowmobile struck two teams during last year's race. One husky was killed and other dogs on the team of four-time winner Jeff King were injured in the bizarre incident, which frightened mushers who were miles from the nearest village and unable to call for help. The snowmobiler, Arnold Demoski, was arrested and later pleaded guilty to assault, reckless endangerment and drunken driving.