A woman was headed southbound on Route 7, when she was rear ended by the car behind her. After stopping in front of Wilton High School, she heard squealing and something hit her bumper. The other motor vehicle was driven by a Wilton man, John O'Hara of 345 Mountain Road, who was later arrested for driving under the influence. A witness of the accident said the 42-year-old man was confused and his vehicle smelled of alcohol. After noting that the driver had difficulty standing and slurred speech, police arrested the man for DUI and also charged him with having an expired vehicle registration.