The Transportation Research Board (TRB) has published a report called Renewing the National Commitment to the Interstate Highway System: A Foundation for the Future. Travel along the nation's Interstate Highway System (like I-25 in Northern Colorado) have increased more than 160 percent between 1980 and 2015. Although Interstate roads make up a smaller portion of overall road mileage, they carry nearly a quarter of all vehicle miles traveled. Despite this importance, maintenance has not necessarily kept up, leading to a backlog of structural and operational deficiencies. Additionally, technology has made giant leaps forward, but the nation's Interstates have not kept up.
For more information, read the article on NPR. To read the report, visit the National Academies Press website.