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Difficulty: EasyFactors Affecting Thinking Distance

Which factor will directly increase a driver's thinking distance when responding to an emergency on the road?

  1. A
    Driving on a road surface covered with standing water
  2. B
    Driving a car that has poorly maintained brakes
  3. Driving after consuming alcohol or taking drowsy medicationAnswer
  4. D
    Driving with under-inflated tyres

Answer

Driving after consuming alcohol or taking drowsy medication
Thinking distance is the distance a vehicle travels while the driver perceives a hazard and reacts to press the brake pedal. Anything that slows the driver's mental processing and physical reflexes—such as alcohol consumption, fatigue, or drowsiness caused by medication—directly increases thinking distance.

Step-by-Step Solution

1
Define thinking distance in the context of stopping distance.
Thinking distance is the distance travelled by the vehicle from the moment a hazard is perceived until the driver actually applies the brakes.
Understanding the definition establishes that thinking distance depends entirely on vehicle speed and driver reaction time.
2
Differentiate driver-related factors from vehicle and environmental factors.
Driver condition (such as fatigue, alcohol, or medication) lengthens reaction time and increases thinking distance, whereas mechanical and environmental conditions (brakes, tyres, wet roads) affect braking distance.
This allows accurate elimination of distractors related solely to vehicle braking efficiency.

Key Concept

Thinking distance is the distance travelled during driver reaction time and is increased by driver impairment such as alcohol, tiredness, distraction, or sedating medication.
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Topics

Factors Affecting Thinking Distance

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