Longest Interstate Highways in the United States - WorldAtlas
I-35 deemed on of the most dangerous roads in the U.S.
The Best and Worst Highways in America
The complex history of the US Interstate Highway System - Engineers Ireland
The longest road in America runs through 12 states – The Hill
Timeline - Contributions and Crossroads: Our National Road System's Impact on the U.S. Economy and Way of Life (1916- 2016) | Federal Highway Administration
Walla Walla agencies prioritize US 12 lane project for state, federal funding | Governments | union-bulletin.com
National Highway System (United States) - Wikipedia