Why is transportation construction so expensive in our area? What kind of honor was it when New York City recently surpassed Zurich (one of the most expensive cities in the world) as No. 1 on the most-expensive-place-to-do-underground-construction dishonor roll? The highly respected Regional Plan Association has studied that question and offers some explanations and frightening examples. Focusing on three recent MTA mega-projects in New York City — the Second Avenue Subway, the No.