During the Napoleonic era, a work was enhanced that would be decisive, together with the artisanal activities above, for the birth of industries. The government improved the "strada statale del Sempione" road that connected Milan with Paris on the Rho – Legnano – Gallarate – Arona – Domodossola – Brig crossing the Alps. Nowadays in Legnano the "strada statale del Sempione" still exists. This important communication route also greatly contributed to the strategic importance of Legnano, the second mail station from Milan.