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Difficulty: MediumFog and Poor Visibility

Daytime running lights provide sufficient illumination when driving through dense fog during daylight hours because they automatically illuminate both the front and rear of the vehicle to standard headlight intensity.

Answer: Answer

Answer

The statement is False.
The statement is false because Highway Code Rule 226 requires drivers to switch on dipped headlights whenever visibility drops to 100 metres or less. Daytime running lights are not a substitute for headlights in dense fog because they do not project a focused beam to penetrate murky air and typically do not illuminate the rear tail lamps, leaving the vehicle unlit from behind.

Step-by-Step Solution

1
Identify the legal lighting obligations for poor visibility under UK traffic regulations.
Highway Code Rule 226 specifies that drivers must use dipped headlights when visibility is seriously reduced, defined generally as 100 metres (328 feet) or less.
Establishing the minimum legal threshold is necessary to evaluate the adequacy of any lighting system.
2
Examine the technical capabilities and lighting distribution of daytime running lights.
Daytime running lights illuminate only the front of the vehicle at low intensity and leave the rear lamps unlit on the vast majority of cars.
Determining whether daytime running lights fulfil both front and rear visibility requirements reveals whether the claim in the statement holds true.
3
Compare daytime running light performance against fog driving requirements.
Relying on daytime running lights in dense fog is legally non-compliant and leaves the vehicle invisible from behind, confirming the statement is incorrect.
A direct comparison resolves the truth value of the statement.

Key Concept

Highway Code Rule 226 mandates the use of dipped headlights when visibility falls below 100 metres, as daytime running lights do not provide adequate forward beam spread and leave the rear of the vehicle unlit.
Estimated Time:45s
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Topics

Fog and Poor Visibility

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