The extension of Metro Line 3 to to Piraeus  upgrades the network of track-based modes of transport in the Attica Basin and creates new prospects for the wider area of Piraeus.

According to various studies, an additional 132,000 citizens will travel by metro Line 3. The city of Piraeus will experience a major traffic congestion relief, since it is estimated that 23,000 fewer cars will be on the road daily. And of course, the environment is significantly protected,  since the reduction of cars on the road means  a reduction in carbon dioxide emissions  by 120 tons per day.