Read the shape and the colour first, the picture second
Shape + colour already tells you what kind of instruction it is. The pictogram only fills in the detail.
German signs are a system, not a picture gallery. Before your eye resolves the drawing, the outline has already told you whether you are being warned, banned, ordered or informed. That is why a driver can obey a sign glimpsed at 100 km/h through rain — and why the exam can test you on a sign you have never seen.
The trap: Learning 150 pictures one by one. Learn six shapes and you can decode a sign you have never seen in your life.
Red triangle, point up = a WARNING
Something is coming. You are told nothing you must do — only what to get ready for.
Gefahrzeichen, StVO Anlage 1 (zu §40). Outside a built-up area they stand roughly 150–250 m before the hazard; inside a town, much closer, because you are already slow. A warning sign never creates a rule — it creates a reason to reduce speed under §3 Abs. 1 StVO, which requires you to drive at a speed you can control.
The trap: Thinking a triangle gives you or anyone else priority. It never does. Only the priority signs do that.
Red circle = a BAN or a CAP
Something is forbidden, or capped at a number.
Verbotszeichen, part of the Vorschriftzeichen in StVO Anlage 2 (zu §41). Red rim, white face, black or red pictogram. If the picture shows a vehicle, that vehicle type is banned. If it shows a number, that number is your ceiling.
The trap: A red circle with a number in it is a maximum. A BLUE circle with a number in it is a minimum (Zeichen 275). Same digits, opposite instruction.
Blue circle = an ORDER
You must do this. It is not an offer.
Also Vorschriftzeichen, StVO Anlage 2. A blue circle with a bicycle does not mean 'cyclists welcome' — it means cyclists must use this path (Radwegbenutzungspflicht, Zeichen 237) and motor vehicles must stay off it. A blue circle with an arrow does not suggest a route; it is the only route you may take.
The trap: Reading blue as friendly. Blue circle = must. Blue rectangle = information. The corner radius is the whole difference.
Blue rectangle = INFORMATION — which can switch on a rulebook
Tells you what kind of road you are now on.
Richtzeichen, StVO Anlage 3 (zu §42). Harmless-looking, and occasionally the most consequential sign on the road: Zeichen 330.1 (Autobahn) silently activates §18 StVO — no pedestrians, no cyclists, nothing with a design speed of 60 km/h or less, no reversing, no U-turns, and no stopping at all, including on the hard shoulder.
The trap: Assuming information signs are optional reading. §18 StVO applies from the sign, whether you noticed it or not.
Yellow diamond = THIS ROAD WINS
You have Vorfahrt (right of way) at every junction until the diamond ends.
Zeichen 306 (Vorfahrtstraße), StVO Anlage 3. The only yellow-and-white diamond in the system, and the single most valuable sign to spot instantly. Your priority runs until the next Zeichen 205, 206 or 307 — the StVO says so in as many words.
The trap: Believing the diamond protects you when you turn LEFT. It does not. §9 Abs. 3 StVO makes every left-turner wait for oncoming traffic, on any road, under any sign.
Grey with a stroke through it = CANCELLED
A rule imposed earlier is lifted. The road's default returns.
Grey never imposes anything. It only removes. When it removes a speed limit, what comes back is the statutory default under §3 Abs. 3 StVO — 50 km/h inside a built-up area, 100 km/h outside for cars and vehicles up to 3.5 t, 80 km/h if you are towing.
The trap: Reading the grey 'end of limit' sign as permission to accelerate freely. The default limit is still a limit.
A wide white board with a sign drawn inside = a ZONE
The rule applies to every street inside the area, not to one stretch of road.
Zone signs (Zeichen 274.1 Tempo-30-Zone, 290.1 Haltverbotszone, 270.1 Umweltzone, 314.1 Parkraumbewirtschaftungszone) stay in force through junctions and around corners until the matching end sign. An ordinary single-post sign generally stops mattering at the next junction; a zone does not.
The trap: Looking for priority signs inside a Tempo-30-Zone. There usually are none — which is exactly why rechts vor links (§8 Abs. 1 StVO) keeps applying at every junction inside it.
Two signs have a unique shape on purpose
Vorfahrt gewähren is the only point-down triangle. Stop is the only octagon.
Both shapes are recognisable from the back and when plastered with snow, because getting these two wrong is what kills people at junctions. The shape carries the message even when the face is unreadable.
The trap: Treating them as interchangeable. Zeichen 205 asks you to yield — you may roll through an empty junction. Zeichen 206 requires the wheels to stop turning, every time, empty road or not.
A small white rectangle under a sign edits that sign
Zusatzzeichen (supplementary plate) — it limits, extends or cancels the sign above.
It can restrict the sign to certain vehicles, certain hours or wet weather, or free a group from it entirely. 'bei Nässe' (Zusatzzeichen 1053-35) makes a limit apply only when the road has a film of water on it. 'Anlieger frei' (1020-30) lets residents and their visitors through a ban that stops everyone else.
The trap: Reading the big sign and driving on. The plate is small and it wins.
In Germany, blue signposts mean motorway — not 'motorway means green'
Blue background = Autobahn. Yellow = Bundesstraße and other non-motorway routes. White = local streets and destinations. Green appears on Autobahn signposts to point AT another Autobahn.
This is the reverse of Italy, Spain and much of South Asia, where green marks the fast road. If you follow green out of habit in Germany you will end up on a country road — or, worse, hesitate at 120 km/h on an interchange.
The trap: Colour habits from home. Re-learn this one consciously; it is the most common navigation error for new arrivals.
Paint on the road is a legal sign too
Lines, arrows and hatching are Vorschriftzeichen with Zeichen numbers, and they are enforced like posts.
Zeichen 295 (Fahrstreifenbegrenzung) — the solid white line — may not be crossed, 'not even partly', in the StVO's own words. Zeichen 294 is the stop line, 298 is the hatched Sperrfläche. At roadworks, temporary YELLOW markings override the white ones underneath.
The trap: Where yellow and white markings disagree, yellow wins. Drivers who follow the white lines through a roadworks contraflow are following the wrong road.