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Difficulty: MediumFactors Affecting Thinking Distance

While travelling at 30 mph on a clear, dry road, a driver suddenly spots an unexpected hazard ahead and must perform an emergency stop. Which factor will directly increase the vehicle's thinking distance?

  1. A
    Driving on a road surface contaminated with loose gravel
  2. B
    Having worn brake pads fitted to the vehicle
  3. The driver feeling sluggish and fatigued from an illnessAnswer
  4. D
    Carrying heavy luggage in the boot of the car

Answer

The driver feeling sluggish and fatigued from an illness
Thinking distance depends strictly on vehicle speed and driver reaction time. Physical conditions such as illness, fatigue, alcohol, or medications slow neural processing and reaction speed, meaning the car travels further before the driver can react and apply the brakes.

Step-by-Step Solution

1
Define thinking distance and identify what determines it
Thinking distance is the distance travelled between noticing a hazard and applying the footbrake, determined solely by vehicle speed and driver reaction time.
Separating driver reaction factors from vehicle and road factors is essential to evaluate stopping components correctly.
2
Evaluate the effect of driver physical impairment
Tiredness, illness, alcohol, drugs, or distractions lengthen driver reaction time, which directly increases the distance covered before braking begins.
At any given travelling speed, a longer reaction time directly results in a longer thinking distance.
3
Distinguish thinking distance factors from braking distance factors
Road contamination, worn brake pads, and vehicle weight only affect the car after the brakes have been applied.
Mechanical and environmental conditions impact tyre-road friction and deceleration, which belong strictly to braking distance.

Key Concept

Factors Affecting Thinking Distance
Estimated Time:1m 0s
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Factors Affecting Thinking Distance

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