Welcome to the M5 South West Motorway. The M5 South West Motorway is a key part of Sydney’s orbital road network and links central Sydney to the South West, Southern Highlands, Canberra and beyond. The M5 covers 21 km and avoids numerous sets of traffic lights. Since its completion, the M5 has saved Sydney motorists countless hours and millions of dollars, reduced air, noise and water pollution and made travelling faster and safer for everyone.