This gap has “a cascading impact on our nation’s economy,” as the ASCE puts it. If nothing changes in terms of infrastructure spending, U.S. gross domestic product (GDP) could lose up to $4 trillion by 2025. Business sales could fall $7 trillion, and 5 million American jobs could be lost. Take a look at the cost of congested roads alone. In 2014, the most recent year of available data, an estimated 3.1 billion gallons of fuel were wasted while we sat idly in traffic. Combined with lost time and productivity, this amounted to approximately $160 billion—all because...