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Difficulty: EasyNight Driving

You are driving on an unlit two-lane rural road at night using your low-beam headlights. Which practice best ensures that you do not overdrive your headlights?

  1. A
    Maintain posted daytime highway speeds while staying focused on the center line markings.
  2. Adjust your vehicle speed so that you can come to a complete stop within the distance illuminated by your headlights.Answer
  3. C
    Rely on a standard two-second following distance to determine your safe stopping interval regardless of speed.
  4. D
    Calculate stopping distance using only vehicle braking distance while excluding perception and reaction time.

Answer

Adjust your vehicle speed so that you can come to a complete stop within the distance illuminated by your headlights.
Adjusting your speed so your total stopping distance is within the distance illuminated by your headlights is the foundational rule of night driving. If you drive faster than this, you will not be able to stop in time once an obstacle or hazard is revealed by your lights.

Step-by-Step Solution

1
Identify the sight distance limitation imposed by headlight illumination at night.
Low-beam headlights illuminate roughly 250 feet, while high-beam headlights illuminate about 350 to 500 feet.
At night, a driver cannot react to or brake for a hazard they cannot see.
2
Apply the safe night driving rule regarding stopping distance and sight distance.
Vehicle speed must be regulated so that total stopping distance (perception + reaction + braking) remains shorter than the headlight range.
Overdriving headlights means driving faster than your ability to stop within your visible field, making collisions with unlit obstacles unavoidable.

Key Concept

Headlight Range and Safe Stopping Distance at Night
Estimated Time:45s
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Topics

Night Driving

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