Autostrada A4 (Italy)

Autostrada A4
Autostrada Serenissima Serenissima motorway
Route information
Part of E55, E64 and E70
Maintained by ANAS
Length	523.1 km (325.0 mi)
Existed	1927–present
Major junctions
West end	Turin
Major intersections	A55 in Turin A5 in Borgo d'Ale A26 in Greggio A50 and A52 in Rho A8 in Pero A51 in Carugate A58 in Agrate Brianza A35 in Ospitaletto A21 in Brescia A22 in Verona A31 in Vicenza A13 in Padova A57 in Venice A27 in Preganziol A28 in Santo Stino di Livenza A23 in San Giorgio di Nogaro A34 in Palmanova RA13 in Sistiana
East end	Trieste
Location
Country	Italy
Regions	Piedmont, Lombardy, Veneto, Friuli-Venezia Giulia
Highway system
Roads in Italy Autostrade State Regional Provincial Municipal
← A 3 → A 5

The Autostrada A4, or Autostrada Serenissima ("Serenissima motorway"), is an autostrada (Italian for "motorway") 523.1 kilometres (325.0 mi) long in Italy which connects Turin and Trieste via Milan and Venice crossing the entire Po Valley from west to east. The city of Venice (or rather, Mestre, a mainland frazione of Venice) originally formed a bottleneck on the A4, but is now bypassed by the Passante di Mestre (the old route through Mestre was renumbered A57). The A4 passes just north of the city of Milan, where it is toll-free. It is a part of the E55, E64 and E70 European routes.