Weather, Visibility and Lighting
Rain, floods, aquaplaning, fog, snow, ice, wind, glare, darkness, lights, visibility and adapting speed and distance.
How to prepare for the DVSA car theory test
Connect each Great Britain rule to a driving decision: read the road, identify who is exposed, preserve time and space, and respond safely before a hazard escalates.
Core concepts
Concept 1
Poor weather reduces grip, visibility and predictability, requiring lower speed and greater separation.
Exam cue: Treat a loss of detail as a reason to slow, not evidence that the road is clear.
Concept 2
Lights help the driver see and be seen but must not dazzle or be misused.
Exam cue: Use fog lights only when visibility is seriously reduced and switch them off when it improves.
Concept 3
Standing water, ice, wind and glare can change vehicle control suddenly.
Exam cue: Test brakes gently after deep water when safe and avoid creating a bow wave.
Risk pitfalls and guardrails
Following normal dry-road distance in rain or ice.
Guardrail: Do not choose an answer merely because it is technically permitted; check whether it preserves view, control, legal compliance and the safety of others.
Using rear fog lights in ordinary rain and dazzling following drivers.
Guardrail: Do not choose an answer merely because it is technically permitted; check whether it preserves view, control, legal compliance and the safety of others.
Accelerating or steering abruptly during aquaplaning.
Guardrail: Do not choose an answer merely because it is technically permitted; check whether it preserves view, control, legal compliance and the safety of others.
Memory anchors
Less View Less Speed
Reduce speed whenever visibility limits the safe stopping distance.
Wet Double
Allow at least twice the dry-road stopping distance in wet conditions.
Ice Tenfold
Stopping distance can be up to ten times greater on ice.
Fog Lights Seriously Reduced
Use them only for seriously reduced visibility and switch off when it improves.
Aquaplane Ease
Ease off smoothly and avoid sudden steering or braking until grip returns.
Sun Can Blind
Slow and stop if glare prevents a safe view.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
How do wet roads affect stopping distance?
In heavy rain, the wheel stops responding normally as the car crosses a sheet of water. Which control choice is safest?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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