National Route A004 is a four-lane highway connecting National Route 1 (mostly known as the "Buenos Aires-La Plata highway") at km marker 31 with the Juan María Gutiérrez Roundabout in Greater Buenos Aires.

This road is the obligatory route for the vacation destinations of Mar del Plata and other cities along the coast of Buenos Aires Province as it connects with Autovía 2, so it has high volumes of traffic during the summer months and Easter.

The highway runs (northeast to southwest) through the towns of Guillermo Enrique Hudson and Juan María Gutiérrez and was built over the old Gutiérrez–Hudson and Valentín Vergara avenues.

[1] The road was opened to the public on 17 November 1995, starting at the southern end at the Juan María Gutiérrez roundabout.

This dangerous cross required a bridge to be built over the roundabout so traffic coming from the Buenos Aires–La Plata highway could continue to the coast without reducing speed.