Sergeant Matt Lee, of Dunedin, said officers responded to reports of a car crash in Double Hill Rd Waitati about 8.30pm yesterday. Poor weather conditions and unfamiliarity with the road contributed to the crash, Sgt Lee said. A Dunedin driver fled the scene of an early morning crash into a median barrier. A vehicle carrying building supplies had hit the median barrier, spilling materials across the motorway, Sgt Lee said. Traffic was diverted to Concord while the scene was cleared, Sgt Lee said.