Emergency services are at a serious crash that has closed State Highway 79 near Geraldine.

A police spokesperson said it was reported at 3.15pm.

The crash involved two vehicles and the Serious Crash Unit has been notified.

State Highway 79 is closed between Tiplady Road and Kennedy Street.

Diversions are in place and motorists should expect delays, the police spokesperson said.

A St John spokesman said six vehicles and a helicopter had been sent to the scene.