Cars pay nothing on German roads, Autobahn included — the toll only applies to trucks. The catch is the Umweltzone: 36 cities require a green Umweltplakette sticker just to enter, vignette or not.
Germany's Lkw-Maut toll system applies only to trucks over 7.5t — nothing to buy for a normal trip car.
Red and yellow stickers stopped being valid anywhere; only green (Schadstoffgruppe 4) is accepted now.
Enforcement is by camera and roadside checks, not just spot stops.
Since October 2024 the old M+S-only marking no longer satisfies the law by itself; the mountain-snowflake symbol is what's checked.
Unrestricted sections are still governed by a duty to drive at a speed you can safely stop within — not a free-for-all.
Use if you already know it's a police matter, not medical or fire.