But the big build out of the highway system occurred in a different era: 1950s - 1970s. I can't think of a single new public infrastructure project that was bui

But the big build out of the highway system occurred in a different era: 1950s - 1970s. I can't think of a single new public infrastructure project that was built so quickly in the US. Projects almost always become bogged down with environmental impact studies, NIMBYism, and bloated costs caused by politically-connected contracting firms and unions.