Highway 4 Rollover Accident Sponsored by: By B.J. Hansen Published Nov 10, 2010 07:12 am Updated Nov 10, 2010 07:13 am Hwy 4 View Photos Copperopolis, CA — There is a single vehicle rollover accident on Highway 4 near Pool Station Road in the Copperopolis area. An ambulance has been dispatched to the accident. Travel with caution on Highway 4 and be prepared for a possible delay. The vehicle is off the road.