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An alternative and easier option is to take the metro (''green line'') to '''Cologno Nord'''. It doesn't really matter which exit you leave the station by, as long as you are walking '''north'''. Follow the road for about 5 or 10 minutes until you get to the beginning of the bridge over the motorway. Rather than actually crossing the bridge, you turn right, off the road, and walk along the raised grassy area beside the motorway. After 4 or 5 minutes you will have reached a gas station.

Walk for around 10 minutes from ''Porto di Mare'' metro station to the petrol station (also ''Agip'') on the other side of the highway. Look on the city map in metro stations how to walk there exactly - very simple.