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Northern Ireland theory revision

Weather & Poor Conditions.

Rain, fog, snow, ice, wind, glare and darkness all change how much time and space you need.

50 PureCar practice questionsFree 10-question topic test
Start Weather & Poor Conditions testBrowse questions

What you need to know

  • Wet-road stopping distance
  • Fog-light use
  • Ice and snow
  • Strong winds
  • Night driving and glare

Common mistakes

  • Using fog lights when visibility is not seriously reduced
  • Following at normal distance in rain
  • Braking harshly on ice
  • Failing to anticipate side winds around gaps and large vehicles

How to revise it

  • Link weather to speed, space and visibility
  • Use the stopping-distance trainer
  • Revise lighting rules
  • Think about how grip changes before a manoeuvre

Example PureCar questions

Use these as explanations, then take the randomised topic test.

When must headlights be used because visibility is seriously reduced?

Answer: Generally when you cannot see for more than 100 metres

The Highway Code says headlights must be used when visibility is seriously reduced, generally below 100 metres.

NI theory practice: When must headlights be used because visibility is seriously reduced?

Answer: Generally when you cannot see for more than 100 metres

The Highway Code says headlights must be used when visibility is seriously reduced, generally below 100 metres.

Test your knowledge: When must headlights be used because visibility is seriously reduced?

Answer: Generally when you cannot see for more than 100 metres

The Highway Code says headlights must be used when visibility is seriously reduced, generally below 100 metres.

Which answer is safest and correct? When must headlights be used because visibility is seriously reduced?

Answer: Generally when you cannot see for more than 100 metres

The Highway Code says headlights must be used when visibility is seriously reduced, generally below 100 metres.

Before your Northern Ireland test, make sure you know this: When must headlights be used because visibility is seriously reduced?

Answer: Generally when you cannot see for more than 100 metres

The Highway Code says headlights must be used when visibility is seriously reduced, generally below 100 metres.

What should you do with fog lights when visibility improves?

Answer: Switch them off

Fog lights can dazzle other road users and must be switched off when visibility improves.

Practice material is independently written by PureCar and linked to Northern Ireland official guidance where appropriate. Checked 21 September 2026.