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Difficulty: MediumNight Driving and Headlight Usage

While driving at night on an unlit road using low-beam headlights, a driver wants to avoid the danger of 'overdriving' their headlights. Which of the following actions should the driver take to ensure safe vehicle control?

  1. A
    Drive at the posted maximum speed limit at all times, assuming posted limits account for low-beam sight range.
  2. Adjust vehicle speed so that the total stopping distance remains within the distance illuminated by the headlights.Answer
  3. C
    Keep high-beam headlights on continuously regardless of surrounding traffic to maximize forward visibility.
  4. D
    Increase speed through dark stretches to minimize the total duration of driving in low-visibility conditions.

Answer

The driver should adjust vehicle speed so that the total stopping distance remains within the distance illuminated by the headlights.
Overdriving headlights happens when a driver travels at a speed where the total stopping distance exceeds the visible range illuminated by the vehicle's headlights. To drive safely at night, drivers must regulate their speed so they can perceive a hazard, react, and bring the vehicle to a complete stop within the area illuminated ahead.

Step-by-Step Solution

1
Understand the concept of 'overdriving' headlights
Recognize that overdriving headlights occurs when a vehicle's stopping distance is greater than the distance illuminated by its lights.
If an obstacle appears at the edge of headlight visibility while overdriving headlights, collision is inevitable because the car cannot stop in time.
2
Determine the appropriate safe driving adjustment at night
Reduce speed so that the total distance needed to react and brake to a stop is less than or equal to the sight distance provided by the headlights.
Matching speed to illuminated sight distance ensures full operational control under basic speed law principles.

Key Concept

Overdriving Headlights and Safe Speed Control
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Topics

Night Driving and Headlight Usage

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