In all three countries, the barriers were among the largest infrastructure projects of the past decade.
The Australian plan is the largest infrastructure project in the country's history.
It is the largest infrastructure project in Europe, costing more, for example, than the London Olympics.
But among the apprentices working on Europe's largest infrastructure project, the figure is 39%.
The project is one of the largest infrastructure projects in Africa.
The $7 billion Keystone XL pipeline is the largest infrastructure project planned in the United States right now.
Still, Agrovila Seis is limping along for now, reflecting the disarray of one of Brazil's largest infrastructure projects.
All up, Victoria's price tag is close to $17bn, the largest infrastructure project in the state's history.
The accessible transport standards, passed in 2002, are arguably the largest infrastructure change, and the biggest spend, in Australia's history.
The Silver Line is one of the largest infrastructure projects of its kind being built in the United States.
It's Africa's largest trade partner, the largest infrastructure financier, and the fastest-growing source of foreign direct investment.
