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Difficulty: MediumFactors Affecting Thinking Distance

You are driving at 50 mph when you spot a stationary queue of traffic ahead. Which factor will increase the distance your vehicle travels before you manage to apply the brakes?

  1. A
    Driving on a road surface covered with loose gravel
  2. Driving while distracted by interacting with the in-car infotainment displayAnswer
  3. C
    Driving with tyres that are underinflated below the recommended pressure
  4. D
    Driving on wet tarmac during a heavy rain shower

Answer

Driving while distracted by interacting with the in-car infotainment display directly increases thinking distance by delaying driver reaction time.
Thinking distance is the distance a vehicle travels during the driver's reaction time—from the moment a hazard is spotted until the brake pedal is pressed. Interacting with an in-car screen or device creates visual, manual, and cognitive distraction, which slows the driver's reaction time and causes the vehicle to travel further at 50 mph before braking begins.

Step-by-Step Solution

1
Define the specific phase of stopping distance described in the question.
The distance covered between perceiving a hazard and physically pressing the brake pedal is the thinking distance.
Overall stopping distance equals thinking distance plus braking distance; identifying the correct phase determines which factors apply.
2
Distinguish between driver-related factors and vehicle/environmental factors.
Driver reaction time and vehicle speed determine thinking distance, whereas road surface, weather, tyres, and brakes determine braking distance.
Mechanical and environmental factors only influence deceleration after the brakes have been engaged.
3
Evaluate the options against the thinking distance criteria.
Interacting with an in-car display causes visual and cognitive distraction, delaying reaction time and increasing the distance travelled before braking.
Any delay in perception or physical reaction prolongs the pre-braking interval.

Key Concept

Thinking distance is determined solely by vehicle speed and driver reaction time, which is lengthened by distractions, fatigue, alcohol, drugs, or illness.
Estimated Time:1m 0s
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Topics

Factors Affecting Thinking Distance

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