Longest one-way road
Who
South Australia
What
21 kilometre(s)
Where
Australia ()
When
2001

The M2 Southern Expressway in Adelaide, South Australia, allows only one direction of traffic flow at any one time. The road runs towards Adelaide city in the morning, swapping to a Southbound flow in the afternoon. It has a total length of 21 km. The road has two lanes and an emergency hard shoulder. The road eases congestion on the Main South Road in South Australia, and has proved a great success with commuters.