A woman has been arrested after colliding with three motorcycles, seriously injuring one rider, while driving under the influence of alcohol this afternoon.
A police spokesperson said officers were alerted to the crash at the intersection of State Highway 1 and Whitaker Rd at 3.50pm.
The woman driving the car failed to stop following the accident in which she ran over one female motorcyclist.
"A driver, impaired by alcohol, collided with a total of three bikes in Warkworth. One of them stayed upright and the other two were knocked down, causing their riders to be injured," a police spokesperson said.
A motorcyclist in her 20s was airlifted to Auckland City Hospital in a serious condition by Westpac Rescue Auckland following the accident.