The M2 is a route in Sydney, New South Wales, Australia. It links Artarmon to Bella Vista. It consists of two separately named motorways, the M2 Hills Motorway and the Lane Cove Tunnel. The M2 route replaces the motorway sections of what was known as Metroad 2 from 1993 to 2013, with the non-motorway sections replaced by the A2 route (made up of Windsor Road and Old Windsor Road).