The three rules that resolve most pairs
Before the individual pairs, three patterns account for a large share of wrong answers.
Colour tells you the type of instruction. A blue circle reserves the road for the thing shown on it. A red ring prohibits the thing shown on it. The same picture of a motorcycle means "motorcycles only" on a blue circle and "no motorcycles" inside a red ring — and reading the picture without reading the colour gets it exactly backwards.
Shape tells you the class. Triangles warn, circles command or prohibit, rectangles inform, and the octagon is the stop sign and nothing else.
Arrow angle matters. A diagonal arrow pointing down is about keeping to one side of something in the road. A horizontal arrow is about turning at the junction ahead. They are different instructions and the only visible difference is the angle.
The pairs that catch people
Each of these is the confusion recorded against that sign in our own library, written against the official Department of Transport chart and checked by a reviewer.
| The pair | How to tell them apart |
|---|---|
| Keep left, vs proceed left only | Keep left has an arrow pointing diagonally downwards: pass to the left of the obstruction. Proceed left only has a horizontal arrow: turn left at the junction |
| Motorcycles only, vs no motorcycles | Blue circle reserves the road for motorcycles. A red ring would ban them. Same picture, opposite instruction |
| Rickshaws only, vs a prohibition | Same trap. A blue circle reserves the way for what it shows; it never bans it |
| Pedestrian crossing ahead, vs pedestrians | The crossing sign shows stripes under the figure, marking a formal crossing. The plain pedestrians sign is a general warning that people may be about |
| Horses and riders prohibited, vs animal-drawn vehicles | One shows a ridden horse, the other a horse pulling a cart |
| Agricultural vehicles prohibited, vs a slow-vehicle warning | This one is a prohibition, not a warning — the red ring is the tell |
| Minibus, midibus and bus command signs | Three separate signs by vehicle size. The midibus is the medium one between the minibus and the full bus |
| Delivery vehicles only, vs goods vehicles only | The delivery vehicle has an open load body with visible cargo; the goods vehicle is a fully enclosed box |
| Taxis prohibited, vs no motor cars | The roof sign on the car is what makes it specifically a taxi prohibition |
| Trams ahead, vs a railway crossing | A tram runs in or alongside the road. A railway runs on its own separate, fenced line |
| Winding road, vs a single sharp curve | The winding-road sign means a series of bends. The trap is accelerating between them and being caught by the next one |
| Dual carriageway begins, vs a fork or side road | This one marks a divided carriageway starting, not a road splitting or joining |
| "For" and "to" distance plates | "For" is how far the hazard lasts. "To" is how far until it starts |
Why the test is built this way
The wrong answers in a sign question are not random. They are the meanings of visually similar signs, or an over-literal reading of the picture — a route marker with an arrow gets "you must turn right" as a distractor, because that is what the arrow looks like if you read it as a command rather than as guidance.
Which means studying signs one at a time, in isolation, prepares you badly. You learn what each sign means and then meet two of them next to each other in a question designed around the difference.
Work in pairs. For every sign you learn, ask what it could be mistaken for.
The mistake underneath all of them
Reading the picture and ignoring the colour and shape. The picture tells you what the sign is about; the colour and shape tell you what you are being told to do about it.
A learner who reads "motorcycle" and answers from the picture will get the blue-circle and red-ring versions of that sign wrong in exactly the same way, twice.
Practise the pairs, not the list
Our sign practice draws from a library checked sign by sign against the official chart, and every answer comes with an explanation of the confusion it turns on. It is free.
Practise road signs freeCommon questions
What is the difference between a blue circle and a red ring on a sign?
A blue circle reserves the road for what it shows — motorcycles only, buses only. A red ring prohibits what it shows. The picture can be identical and the instruction is the opposite.
How do I tell a keep-left sign from a turn-left sign?
By the angle of the arrow. Keep left has an arrow pointing diagonally down, telling you to pass to the left of something in the road. Proceed left only has a horizontal arrow and applies to the junction ahead.
What do the sign shapes mean?
Triangles warn you about something ahead, circles carry commands and prohibitions, rectangles give information or guidance, and the octagon is the stop sign — the only eight-sided sign on the road.
How many road signs do I need to know?
There are several hundred in use. You do not learn them one by one — you learn the system of colour and shape, then the pairs that are genuinely easy to mix up, which is a much shorter list.
Sources
- Road Traffic Signs chart, National Department of TransportThe official sign chart, and the ground truth every sign in our library is verified against — code, name, category, variant and artwork.
- Our own verified road sign libraryEach pair on this page is the confusion recorded against that sign when it was checked against the chart, not a list invented for this article. 64 of the 380 signs we serve carry a recorded confusion of this kind, and each carries a named reviewer's sign-off.
- National Road Traffic Regulations, 2000 — Schedule 1Where the prescribed meaning of each road traffic sign is set out, including the regulatory signs referred to above.
Last updated 2026-09-21.