Road Signs Trivia You Need to Know

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Busy UK motorway with multiple vehicles including cars, vans, and trucks driving in both directions under clear weather. Road signs indicate directions to Bridgend, Pen-y-bont, Port Talbot, and Llantwit Road via A4119. Speed limit sign shows 50 mph and warning sign for congestion ahead. Picture features a variety of used cars and new cars in traffic on a multi-lane divided highway surrounded by trees.
Busy UK motorway with multiple vehicles including cars, vans, and trucks driving in both directions under clear weather. Road signs indicate directions to Bridgend, Pen-y-bont, Port Talbot, and Llantwit Road via A4119. Speed limit sign shows 50 mph and warning sign for congestion ahead. Picture features a variety of used cars and new cars in traffic on a multi-lane divided highway surrounded by trees.

Having driven for months, years, decades, you are 99% sure you have encountered every possible road sign in the UK. Even with the few you haven't yet come across, it should be simply enough to decipher them, shouldn't it?

Not according to Admiral Insurance. They point out that vague road signs, the ones without letters, numbers or directions, can confound even the most self-assured drivers - no matter how long they've been on the road.

So, to herald 25 years of the UK driving theory test, we've pulled together a guide and online quiz that not only explains the rules behind UK road signs, but also provides some invaluable top tips we bet you forgot from your theory test.

Take a look at our helpful road signs run-down, below.

Shapes and colours

From a simple courtesy to a compulsory directive, shape completely changes the meaning of a road sign.

Shape is the critical feature that helps drivers stay safe even when weather events make a sign's text or colour illegible, while colour provides context.

As you'll remember from the Highway Code, we use three basic shapes in the UK (triangles, circles and rectangles) and six colours (red, blue, green, white, brown, yellow).

Triangles

Illustration of three road warning signs against winding roads on a green background with snowflakes. The first sign shows a snowflake symbol warning of icy conditions with a curvy road and icy patches. The second sign depicts a sharp curve to the left. The third sign indicates slippery road conditions with a car leaving skid marks. These signs are important considerations for safe driving of used cars and new cars in variable weather and road conditions.

To begin, there is the triangle. A triangle road sign warns oncoming drivers about an upcoming road layout (roundabouts, junctions, two-way traffic) or hazards ahead (ice, sharp bends, slippery road).

Red denotes a prohibition or 'negative instruction', which is most often represented as a triangular sign with a white background and thick red border.

Circles

Illustration of three vertical road signs along different road types: a 30 mph speed limit sign on a grey road with yellow dashed lines, a no motorcycles and cars allowed sign on a brown dirt path, and a blue roundabout sign on a grey road with an aerial view of a roundabout above it. The image conveys traffic regulations relevant to driving used cars and new cars.

If you spot a circular road sign on your travels, you're being given an order or instruction that must be obeyed.

Circular road signs are usually either red or blue; red denotes a negative instruction ("do not") and blue provides a positive instruction ("do"). That's why "no overtaking" and speed limit signs have a red border, while "turn left" and "right of way" signs have a blue border.

Rectangles

Illustration of three road signs on separate roads. The first sign is brown with a castle icon and reads 'Archer Castle 10 miles'. The second sign is white with black text and a camera icon, reading 'Traffic signal cameras' with two yellow traffic signal cameras above it. The third sign is green with white text and an arrow pointing right, reading 'London A40'. Background includes curved roads and a clock tower in the distance. Keywords related to used cars and new cars are not directly represented in the image.

Rectangles are helpful signs that inform oncoming drivers of what's coming up on the road.

Colours vary widely on rectangular signs although motorways and "no through-road" signs are typically blue. Green rectangular signs provide directions on primary roads, white indicates minor roads and speed cameras, and brown denotes tourist information.

No parking zone sign featuring a red circle with a blue background and a red diagonal line, indicating no stopping. Below the symbol, text reads 'ZONE' with parking restrictions from Monday to Friday, 08:30 to 18:30, and Saturday, 08:30 to 13:30. Image on a green gradient background, relevant for users browsing used cars and new cars to be aware of parking limitations.

Rectangular signs also convey important, and often complex, information. As such, they sometimes embed other road signs within their shape. For instance, "controlled zone" information is depicted as a white rectangle with a blue and red "no waiting" circle embedded in the shape.

Exceptions to the rules

While we always advise you follow the Highway Code to the letter, there are some notable exceptions to common road signs rules which should not be ignored.

STOP signs

Red octagonal stop sign with white border and the word 'STOP' in bold white letters, set against a green gradient background, symbolising a traffic control for vehicles including used cars and new cars.

"STOP" signs are one of few road signs which do not fall within the triangle, circle, or rectangle triumvirate. Rather, they are octagon-shaped.

The unique shape of an octagon alerts drivers to the urgent STOP message - all without having to read the sign's wording. The reason being that even while travelling in the opposite direction or if defaced by snow*, drivers from both directions clearly see a STOP sign.

*Extra trivia: Do you know why signs always have rounded corners? They're safer for passers-by (no sharp edges) and are more resistant to rain and snow.

Yield signs

Triangular road sign with a red border and white centre displaying the text 'GIVE WAY' against a green gradient background, relevant for used cars and new cars road safety.

Similarly, some triangle signs are positioned upside-down to make their messaging more distinctive. These inverted triangles are called "yield signs".

Yield signs are critical as they instruct drivers to prepare to stop for oncoming traffic. Where the yield sign is applied differs around the world but, in the UK, they are used only on "GIVE WAY" signs.

Yellow signs

Yellow road sign with a no parking symbol and text stating '8 am - 6 pm' with a black left arrow, indicating no parking or stopping from 8 am to 6 pm to the left, relevant for used cars and new cars parking regulations.

Yellow is a maverick sign colour. This colour pops up sporadically and could mean all manner of instructions depending on where it's situated.

For instance, a sign with a yellow background could denote diverted traffic details, enforcement hours for parking charges, and many more. There are few hard and fast rules for yellow - which is why signs with a canary complexion are typically misunderstood on theory tests.

Strikethrough circles

No U-turn road sign with a red circle and a diagonal line across a black U-turn arrow on a white background, set against a green gradient backdrop, symbolising traffic rules relevant for used cars and new cars drivers.

While many prohibitive circles (i.e. those with a red border) do not include a strikethrough to indicate a negative instruction, confusingly, a handful do.

Circles which have a red border and a red strikethrough are largely applied to turning orders, such as "no U-turn" or "no left/right turn" signs. Oddly, the red border alone represents a prohibition/warning, which makes the strikethrough redundant.

So, why is it there? Our best guess is that a thick red diagonal line draws extra attention to notices where, if not followed, could cause a serious head-on collision.

Mixed colour signs

No stopping traffic sign with a red border and blue background featuring a red diagonal cross on a green gradient backdrop. The image does not contain text related to used cars or new cars.

Colour combinations in road signs are confusing - and all too common.

If you're stuck, the golden rule is to rank the colours in order of urgency: red is most important, then blue, and all the rest thereafter.

Consequently, when you see a red and blue "no stopping" or "no waiting" sign, you should follow the red "warning" first. As you already know that red represents a prohibitive order, you're therefore able to infer that this sign is conveying a negative instruction - and therefore you should "stop" or "wait", depending on the respective sign.

Additional trivia

Did you know there are two special typefaces used only on British roads?

The first is Transport, which uses mixed-case wording, as seen on all fixed permanent signs except motorways. Mixed-case is preferred over 'all capitals' for the simple reason that word spaces are more prominent and therefore easier to read.

The second typeface is called Motorway. As you'd expect, this is the typeface for motorway signs, and is different from Transport as it uses elongated lettering and the numbers are larger.

Now you've learned all there is to know about road signs, it's time to put your newfound knowledge to the test. Have a go at our taxing 50/50 quiz to see how you compare against the rest of the UK.