https://transportationhistory.org/2026/05/21/1961-the-start-of-the-first-national-highway-week-in-the-united-states/Transportation Historyen2026-05-21T17:26:24+00:001961: The Start of the First National Highway Week in the United StatesAASHO, California, Ohio, highways, research, trucks, Interstate Highway System, infrastructure, District of Columbia, Los Angeles, Alabama, Iowahttps://transportationhistory.org/wp-content/uploads/2026/05/i-80-nara_1961_34.jpg?w=143https://transportationhistory.org/2026/05/20/1972-music-and-a-motorcade-mark-the-opening-of-a-tunnel-in-ontario/Transportation Historyen2026-05-20T16:26:13+00:001972: Music and a Motorcade Mark the Opening of a Tunnel in Ontariotunnel, automobiles, canal, Canada, highways, waterway, pedestrians, motor vehicles, street, walkway, sidewalks, infrastructure, Ontariohttps://transportationhistory.org/wp-content/uploads/2026/05/main_street_tunnel_welland.jpg?w=150