| Country: | ITA |
| Type: | A |
| Route: | 51 |
| Alternate Name: | Tangenziale Est di Milano Milan east ring road |
| Established: | 1973 |
| Beltway City: | Milan |
| Direction A: | South |
| Terminus A: | Milan |
| Junction: | A1 in Milan A52 in Cologno Monzese A4 in Agrate Brianza |
| Direction B: | North |
| Terminus B: | Usmate Velate |
| Length Km: | 29.4 |
| Regions: | Lombardy |
| Map: | Italia - mappa autostrada A51.svg |
| Map Notes: | The motorway A51 and the connecting motorways |
| Previous Type: | A |
| Previous Route: | 50 |
| Next Type: | A |
| Next Route: | 52 |
Autostrada A51 or Tangenziale Est di Milano ("Milan east ring road")[1] is an autostrada (Italian for "motorway") long in Italy located in the region of Lombardy and tangent to the city and suburban area of Milan in its eastern part, managed by Milano Serravalle – Milano Tangenziali.
Together with the Autostrada A50 (Milan west ring road), the Autostrada A52 (Milan north ring road) and the Autostrada A58 (Milan external east ring road), it is the largest system of ring roads around a city in Italy, for a total length greater than .[2] By adding the urban sections of Autostrada A1 and Autostrada A4, which runs parallel to the Milan north ring road by connecting Autostrada A51, Autostrada A50 and Autostrada A58, to the four ring roads, a system of urban highways that totally surrounds the city. The traffic flow that affects this stretch of motorway is over 170,000 daily transits.[3]
| TANGENZIALE EST DI MILANO Autostrada A51 | |||||
| Exit | ↓km↓ | ↑km↑ | Province | European Route | |
|---|---|---|---|---|---|
| Raccordo A1-A51 Raccordo A1-Piazzale Corvetto Milano - Napoli | 0.0 | 29.3 | MI | rowspan=31 align="center" | -- |
| Piazzale Corvetto - Via Emilia Milano - San Donato Milanese | 0.5 | 28.8 | |||
| Paullo - Paullese MM3 San Donato | 1.0 | 28.3 | |||
| Via Mecenate Peschiera Borromeo | 2.5 | 26.8 | |||
| C.A.M.M. Consorzio Autostazione Merci di Milano | 3.0 | 26.3 | |||
| Milano Viale Forlanini Milan Linate Airport Tangenziale Est Esterna di Milano | 4.0 | 25.3 | |||
| Via Rubattino Segrate | 6.0 | 23.3 | |||
| Segrate Tangenziale Est Esterna di Milano | 6.7 | 22.6 | |||
| 7.0 | 22.3 | ||||
| Rest area "Cascina Gobba"[4] | 9,7 | 19,6 | |||
| Cascina Gobba - Via Padova Padana Superiore - Vimodrone V.le Palmanova MM2 Gobba San Raffaele Hospital | 10.5 | 18.8 | |||
| Tangenziale Nord Milan Malpensa Airport | 11.5 | 17.8 | |||
| Cologno Ovest Connection with the Autostrada A52 in the south direction. | 12.0 | 17.3 | |||
| Cologno Est MM2 Cologno Nord Brugherio | 14,0 | 15,3 | |||
| Rest area "Cologno Est" | 15.7 | 13.6 | |||
| Cernusco S.N. Brugherio sud | 16.0 | 13.3 | |||
| 18.0 | 11.3 | ||||
| Rest area "Carugate" | 19.0 | 10.3 | MB | ||
| Toll gate Agrate Brianza | 19.5 | 9.8 | |||
| Torino - Venezia Milan Bergamo Airport | 20.5 | 8.8 | |||
| Agrate Brianza | 21.0 | 8.3 | |||
| Monza Est | 21.2 | 8.1 | |||
| Concorezzo Agrate nord | 22.0 | 7.3 | |||
| 24.0 | 5.3 | ||||
| 25.0 | 4.3 | ||||
| Vimercate Centro - Oreno Vimercate Hospital | 26.0 | 3,3 | |||
| Vimercate Nord - Velasca | 28.0 | 1.3 | |||
| Rest area "Vimercate ovest" | align="right" | -- | 0,8 | ||
| 29.0 | 0.3 | ||||
| Usmate Velate Sud | 29.2 | 0.1 | |||
| Briantea | 29.3 | 0.0 | |||