sentences:  The current route varies in construction from a 2-lane road (at its southernmost end) to a freeway with frontage roads (near the World Trade Bridge).In recent years, much of Laredo's growth has been along Loop 20, with the construction of a new passenger terminal at Laredo International Airport, the Laredo Energy Arena, the new campus of Texas A&M International University, and Doctors Hospital being the most prominent projects.Loop 20 was designated on September 26, 1939 from US 96 (later US 59, and now SH 359) to US 83 in Laredo as a renumbering of SH 12 Loop.