Staten Island, NY - A man sucker-punched an NYPD traffic agent and knocked him unconscious after being written a ticket earlier in the day Wednesday, police said. The 50-year-old traffic agent was walking near the corner of Heberton Street and Post Avenue at about 2:55 p.m. when the suspect came up from behind and socked him in the throat. He was taken to Staten Island University Hospital and treated for a head injury and a bruise on his neck, police said.