Similarly, the most expensive US highway expansion project was the "Big Dig" in Boston, Massachusetts, which cost $200 million per lane mile for a total cost of $14.6 billion.
Karena itu, proyek perluasan jalan bebas hambatan termahal di Amerika Serikat adalah "Big Dig" di Boston, Massachusetts, yang beranggaran US$124 juta per km lajur dengan total biaya US$14,6 miliar.