Near Puhoi, on the Hibiscus Coast, SH 1 widens to a four-lane motorway known as the Auckland Northern Motorway. The first of the motorway is an automated toll road. At Orewa, the motorway becomes toll-free, crossing farmland to the North Shore of Auckland. The road crosses through suburbs to the Waitematā Harbour, which it briefly follows before crossing it by the Auckland Harbour Bridge. The motorway comes off the bridge into Auckland's city centre, and forms its western boundary as SH 1 proceeds to the Central Motorway Junction.