The Westlink M7 is a 40-kilometre tolled urban motorway in Sydney, New South Wales that is part of the Sydney Orbital Network. Owned by the NorthWestern Roads Group, it connects three motorways: the M5 South-West Motorway at Prestons, the M4 Western Motorway at Eastern Creek, and the M2 Hills Motorway at Baulkham Hills. From Wikipedia
