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Difficulty: MediumNight Driving and Headlight Usage

While traveling at 50 mph along a dark rural route with low-beam headlights engaged, you notice your lights illuminate objects up to 160 feet ahead. Given that your vehicle's total stopping distance at this speed is roughly 200 feet, which adjustment is required to drive safely?

  1. Reduce your travel speed until your stopping distance is within the distance illuminated by your headlights.Answer
  2. B
    Maintain your current speed of 50 mph as long as you do not exceed the posted speed limit.
  3. C
    Switch to high-beam headlights permanently, even when following or approaching other traffic.
  4. D
    Slightly increase your speed to pass through the dark area more quickly and shorten exposure time.

Answer

Reduce travel speed until the stopping distance does not exceed the distance illuminated by the headlights.
Overdriving headlights occurs when a driver's stopping distance is greater than the distance illuminated by their headlights. To operate safely under low-beam lighting, speed must be reduced so the vehicle can stop within the visible space ahead.

Step-by-Step Solution

1
Compare stopping distance with headlight sight range
Stopping distance (200 feet) exceeds low-beam illumination distance (160 feet), creating an overdriving situation.
If an obstacle appears at the edge of the light beam, the vehicle cannot stop in time at 50 mph.
2
Apply the basic speed law and night driving safety rules
Slow down to match visual range
Safe night driving requires maintaining a speed at which total stopping distance remains within visible headlights range.

Key Concept

Avoiding Overdriving Headlights
Estimated Time:1m 0s
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Topics

Night Driving and Headlight Usage

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