Just 850 million euros of public money to build a mile and a half long tunnel under downtown! (Under a billion euros total.) A bi-level tunnel, with separate express and local levels, and four lanes on each level.<p>By contrast, the SR99 tunnel in Seattle was about 1/3 longer, cost $3-4 billion, depending on how lawsuits shake out, and has half the capacity (two levels with two lanes each). The Big Dig in Boston was the same length, and cost <i>22 times</i> as much.<p>In timely news (another post on the front page), the A2 tunnel cost only modestly more than it’s costing San Francisco to simply reconfigure Market Street to shut down through traffic.