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Conversion of the N-620 to autovía standard began in the mid-1980s, when the section between Palencia and Valladolid was upgraded to dual carriageway with same-level junctions. During the 1990s, the Burgos - Palencia and Valladolid - Salamanca sections were upgraded in a similar manner, but with grade-separated junctions and slip roads; the junctions on the Palencia - Valladolid section were improved accordingly at a similar time.
The A-62 designation was introduced in 2003, as part of the general renumbering of Spanish autovías. The section between Salamanca and Ciudad Rodrigo was built during 2003 and 2004, and the section between Ciudad Rodrigo and Fuentes de Oñoro during 2008. The final section, connecting Fuentes de Oñoro with the Portuguese border and the A25 autoestrada, opened in 2021.
References
^"Jefatura del Estado"(PDF). boe.es (in Spanish). 30 September 2015. Retrieved 29 July 2023.
