That's a good shout. Does it link to your reg and the coppers in CH just check that then? Probably a good idea to carry a print out for proof of payment in case you get stopped?Our group trip in May includes Switzerland.
I think I will buy a digital vignette in advance, at forty Swiss francs a year its hardly going to cripple me compared to the fines if caught without one.
Via Portal: Ihr digitaler Schlüssel für E-Vignette und PSVA
Auf dem Via Portal, der offiziellen Plattform des Bundes, können Sie Strassenabgaben zeit- und ortsunabhängig entrichten, wie z.B. E-Vignette oder PSVA.via.admin.ch
My mother in law is Swiss so I am used to their "very-to-the-point"

