Which European countries actually use a vignette
Where you need a vignette and where you're paying tolls instead, laid out country by country.

If you've driven through Central Europe more than once, you've probably noticed that no two countries charge for road use the same way. Some sell you a pass for a fixed period. Others bill you for every kilometre you drive on a toll road. Mixing up the two on the same trip is one of the most common ways drivers end up with an unexpected fine, so it's worth knowing which system you're dealing with before you cross a border.
Countries that use vignettes
Austria, Switzerland, the Czech Republic, Slovakia, Slovenia, Hungary, Romania and Bulgaria all run on a vignette model. You pay once for a set window of time, anywhere from a single day to a full year depending on the country and the option you pick, and that covers you for motorways and expressways for the whole period. There's no per-kilometre calculation and no toll booth to stop at. You buy it, it's linked to your licence plate or displayed on your windscreen, and you drive.
The catch is that a vignette only covers the roads it's meant to cover. Regular motorways and expressways, yes. Certain mountain tunnels and premium routes, not always. Austria's Brenner, Arlberg and Tauern sections are the clearest example: even with a valid vignette, those specific stretches charge an additional toll on top.
Countries that charge by distance
France, Italy, Poland and Spain use a different model entirely. You take a ticket at a barrier when you enter the motorway and pay based on how far you travelled when you exit. There's no upfront purchase and no fixed period to plan around, but it also means the cost scales directly with your route, and a long drive across the country can add up quickly at the toll booths.
Why it matters when you're planning a route
A single road trip through the Alps can cross four or five of these systems in a week. Leave Austria heading into Italy and you go from a vignette country to a pay-per-kilometre one overnight. Skip a vignette purchase because you assumed the rules were the same as the last country you drove through, and you're looking at a fine rather than a toll receipt. The safest approach is to map out your route in advance and check, country by country, which system applies before you leave rather than figuring it out at the border.