Police have released the names of the two people killed on the roads at the weekend.
James Wilson Higgie, a 21-year-old builder from Alexandra in Central Otago, died on Earnscleugh Road, between Clyde and Alexandra, about 9.55pm yesterday.
Detective Sergeant Derek Shaw of Central Otago CIB said it appeared Mr Higgie was travelling away from Clyde with three other men on motocross bikes when two of them collided.
Mr Higgie died at the scene and a second rider was admitted to Dunstan Hospital with moderate injuries.
Mr Shaw said the injured man had since been discharged from hospital and was recovering at home with family.
An investigation into the cause of the accident was continuing.
Police were seeking information about the movements of these or other motocross bikes in Clyde on Sunday evening.
Police were particularly interested in a vehicle believed to have passed the four motorcycles near the Clyde bridge, travelling towards Earnscleugh.
Police also released the name of an 18-year-old woman who died in an Oamaru car crash yesterday.
Natasha Sheree Maindonald, 18, died in an accident on Parsons Road about 5.45pm.
Four others in the car escaped serious injury.
Police were investigating the cause of the crash.
