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Walk for around 10 minutes from ''Porto di Mare'' metro station to the petrol station (also ''Agip'') on the other side of the motorway. Look on the city map in metro stations how to walk there exactly - very simple. Option 2 : Another easier option to reach Bologna and South Italy is to take the Green Line to Cascina Gobba, after that get out from the station and you should see many orange buses( Atm), so go left and you will find a gate, go in and walk until you will arrive to a roundabout and from there you can see the gas station in the highway which you reach easily in two minutes.The advantages of this spot compared to the "Porto di Mare" spot is that this is on the highway, Porto di Mare it's not. So it should work fine!