There is a petrol station on the A8, before the junction where the A9 branches off, leading towards Switzerland.
You can reach it by taking a local train to the community of Rho (S5 or S6 should go there, 5 stops, 2-3 Euros but there are no barriers et5) and then taking a bus towards Lainate. Just ask around at the bar in the Rho train station, they should be able to tell you what bus to take (a blue one, not the orange ones!) The bus should cost around 1,55 Euros. Get off at the stop Via Pagliera or Via Alessandro Manzoni, and walk towards the little roundabout between Via Giacomo Puccini, Via Scarlati and Via Gaetano Donizetti. This is an industrial area, just walk to the end of Via Gaetano Donizetti, you will reach the petrol station, southwards (there is a turnstile in the fence). On the petrol station, find the sottopassagio/underground walkway which will take you to the other side. From there, it should be easy to get a hitch on the A8 or A9 northwards, towards Lago Maggiore, Lago di Como, Switzerland.
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