A vehicle's total stopping distance is comprised of thinking distance and braking distance. Match each driver condition or situational factor to its direct mechanism affecting thinking distance.
- Doubling travelling speed while remaining alertDoubles the distance covered during reaction time without changing biological response speed
- Severe fatigue from extended continuous drivingSlows central nervous system reflexes and delays physical muscle actuation of the brake pedal
- Engaging in a hands-free mobile phone conversationInduces cognitive distraction, narrowing situational awareness and delaying hazard identification
- Driving after taking drowsy antihistamine medicationCauses pharmacological sedation, impairing hazard perception and prolonging neural processing time
Answer
Doubling travelling speed matches doubling distance covered at constant reaction time; severe fatigue matches slowed neuromuscular reflexes; engaging in hands-free phone use matches cognitive distraction and delayed hazard identification; taking drowsy antihistamines matches pharmacological sedation and prolonged neural processing.
Thinking distance depends strictly on vehicle speed and driver reaction time. Doubling speed doubles distance covered during reaction time. Hands-free phone use introduces cognitive distraction that delays hazard perception. Fatigue degrades neuromuscular reflex speed. Drowsy medications pharmacologically prolong central nervous system processing time.
Step-by-Step Solution
Key Concept
Thinking distance is the distance travelled while reacting to a hazard () and is solely determined by vehicle speed and driver reaction time (perception, cognitive processing, and physical reflex speed).
Estimated Time:1m 30s