UK Traffic Signs Explained: Shapes, Colours and Meanings

UK traffic signs follow a simple system: circles give orders, triangles warn and rectangles inform. Within that, a red circle usually means something is prohibited, a blue circle gives a positive instruction, and the colour of a direction sign tells you the type of road: blue for motorways, green for primary routes and white for local roads. Learn the shapes and colours first, and most signs make sense even if you've never seen them before.

Traffic signs are tested in the theory test and on the road; "not responding correctly to traffic signs" is one of DVSA's top 10 reasons for failing the practical test.

The three main sign shapes

Signs giving orders (circles)

Red circles: mostly prohibitive

A red ring tells you what you must not do or the maximum you can do, for example:

• speed limits (20, 30, 40 and so on)
• no right turn or no U-turns
• no overtaking
• weight, width or height limits

A plate beneath a sign can qualify its message, such as the times a restriction applies.

Blue circles: mostly positive instructions

A blue circle without a red border tells you what you must do, for example turn left ahead, keep left, or a mini-roundabout (where you give way to traffic from your immediate right).

Exceptions: stop and give way

Two order signs have unique shapes so they're recognisable from any angle or when covered in snow:

• Stop: a red octagon. You must stop at the line, even if the road looks clear.
• Give way: an upside-down triangle. Give way to traffic on the major road.

Warning signs (triangles)

Warning signs are mostly triangular with a red border. They tell you what's ahead so you can adjust your speed and position:

• bends and junctions
• roundabouts and traffic signals ahead
• pedestrian crossings, schools and elderly people
• road narrows, steep hills, slippery roads
• animals, cyclists and level crossings

A distance plate below the sign may tell you how far ahead the hazard is. Treat every warning sign as a cue to check your mirrors and plan, just as you would in the hazard perception test.

Direction signs (mostly rectangles)

The background colour tells you what kind of road you're on or heading to:

On a green primary route sign, a route number on a blue background shows the way to a motorway. Countdown markers at a motorway exit show the distance to the slip road; each bar represents 100 yards. Our motorway driving tips explain how to use them.

Information signs

Information signs are rectangular. They cover things like parking, bus lanes, one-way streets, and advance warning of a restriction ahead.

Road markings matter too

Signs work together with road markings, such as give way lines, double white lines, box junctions and lane arrows. "Not responding correctly to road markings" is also in DVSA's top 10 fail reasons. See common driving test fails.

How to learn traffic signs for the theory test

1. Start with shapes and colours, using the tables above.
2. Study Know Your Traffic Signs, one of the three books DVSA says the theory test is based on.
3. Group signs by type: orders, warnings, directions, information.
4. Use flashcards or short daily quizzes.
5. Call out signs on real drives with your instructor or supervisor ("commentary driving").

Our theory test revision plan includes a week on signs, and UK speed limits covers the limits signs show.

Summary

Circles give orders, triangles warn and rectangles inform. Red circles prohibit, blue circles instruct, and direction sign colours show the road type: blue for motorways, green for primary routes, white for local roads and brown for attractions. Stop and give way signs have unique shapes. Learn the system, then the details.

Revise signs with Co-Drive

Co-Drive is an iOS app with original theory practice questions written from The Highway Code (not official DVSA questions), including traffic signs and road markings, with spaced review to bring back the ones you forget. Try Co-Drive.