What happens if your vignette expires mid-trip
There's no grace period once it lapses. Here's how to avoid finding that out the hard way.
A vignette doesn't extend itself once it runs out — if the validity period ends while you're still on the road, you're driving without coverage from that point on, the same as if you'd never bought one. Most systems check this automatically by camera, so there's no grace period and no one to explain the situation to at the roadside.
The fix is straightforward in theory: buy the next one before the current one lapses. Where it gets people is the assumption that validity runs from the day of purchase. Some vignettes actually start on a fixed calendar day regardless of when you buy them, which means a pass bought on a Tuesday for “10 days” might not mean 10 days from that Tuesday. It's worth checking the actual start and end dates on the confirmation rather than counting days from memory.
If your travel plans are even slightly uncertain — an extra day added to the trip, a delayed return — it's generally cheaper and less stressful to buy a slightly longer validity period upfront than to risk an unplanned gap and the fine that comes with getting caught in it.