UK Driving Theory Guide

Key Concepts

Road signs communicate legal rules, hazards and helpful information; recognising them quickly is essential for safe driving and for the theory exam. You must know sign shapes, colours and what they require you to do.

• Circular signs with a red border = prohibitions or mandatory limits (e.g., 30 mph).
• Triangular signs = warnings of hazards ahead (e.g., junctions, bends).
• Blue circular/rectangular signs = mandatory instructions or services.
• Rectangular signs with green or white backgrounds = directional or informational.
• Temporary signs (usually on yellow backgrounds) override permanent signs on the road.
• Road markings and signs work together (e.g., no entry plus solid white lines).
• Symbols matter: a red circle with a white centre means “no entry”; a blue circle with a white arrow means “must pass” direction.

Before you continue: What does a circular sign with a diagonal red line through a horn symbol mean?

Key Terms

Warning sign - A triangular sign indicating a hazard ahead; usually with a red border.

Regulatory sign - A sign that tells you the law or a rule (e.g., speed limits, no entry).

Informational sign - Rectangular signs giving directions, services or distances.

Temporary sign - Signs on yellow backgrounds used for roadworks or temporary hazards.

Give way - A regulatory instruction often shown by an inverted triangle; you must yield.

Mandatory sign - Typically blue and circular, showing actions you must take (e.g., turn left).

No entry - Red circle with white horizontal bar; you must not enter the road.

Active Recall:

Warning sign

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Regulatory sign

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Informational sign

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Temporary sign

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Give way

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Mandatory sign

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No entry

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Worked Examples

1) You approach a triangular sign showing a steam train symbol. Step-by-step: identify shape (triangle = warning), read symbol (railway crossing ahead), reduce speed and look for barriers, prepare to stop. Real-world note: level crossings can be unguarded; expect no barrier up to 160m in rural layouts. Now you try: You see a triangular sign with a curved arrow left symbol. What do you do?

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2) You pass a circular white sign with a red border and number 20. Step-by-step: recognise circular red-bordered = speed limit, the number is max mph (20 mph), immediately ensure speedometer at or below 20, watch for repeater signs. Application: in built-up zones near schools this is common. Now you try: You encounter a blue circle with two white arrows pointing left and right. What does it mean and how do you respond?

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3) Complex: temporary yellow rectangular sign reads “Road closed ahead, diversion”. Steps: note temporary yellow = roadworks/temporary, follow diversion symbols, do not assume permanent route, check for official diversion number (e.g., diversion A5). Now you try: A yellow sign shows a symbol of men at work and an arrow right. How should you act?

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Practice Questions

(Easy) What shape and colour is a warning sign?

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(Easy) What does a blue circular sign with a white left arrow require you to do?

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(Medium) How do temporary signage and permanent signage interact if they conflict?

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(Medium) Identify the meaning of a rectangular green sign showing a motorway number.

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(Hard) You approach a junction with a “Give Way” sign and road markings of a solid white line on your side and dashed lines on the other....