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Difficulty: MediumSpeed Limits and Speed Regulation

A motorist is driving on an unlit rural highway at night where the posted maximum speed limit is 50 mph50\text{ mph}. According to speed regulation laws and safe driving principles, how should the driver determine their maximum safe operating speed under these conditions?

  1. Adjust speed so that the vehicle can come to a complete stop within the distance visible by the vehicle's headlights.Answer
  2. B
    Maintain the posted limit of 50 mph50\text{ mph} at all times because statutory limits apply equally during day and night.
  3. C
    Increase speed slightly above 50 mph50\text{ mph} to minimize the total amount of time spent driving on dark roads.
  4. D
    Drive at half the posted limit regardless of headlight brightness or road layout.

Answer

Adjust speed so that the vehicle can come to a complete stop within the distance visible by the vehicle's headlights.
The correct answer highlights the primary rule of nighttime speed regulation: drivers must never 'overdrive' their headlights. Operating at a speed that allows stopping within the clear distance illuminated ahead ensures the driver can react to unexpected hazards in the dark.

Step-by-Step Solution

1
Identify the environmental constraint affecting safe driving speed.
Nighttime driving on an unlit road significantly reduces forward visibility.
Headlights only illuminate a limited distance ahead of the vehicle.
2
Apply the Basic Speed Law to nighttime driving conditions.
The driver must operate at a speed that permits stopping within the illuminated distance (avoiding 'overdriving' headlights).
If a hazard appears at the edge of headlight reach, traveling too fast prevents stopping in time.

Key Concept

Basic Speed Law and Nighttime Speed Regulation (Overdriving Headlights)
Estimated Time:1m 0s
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Topics

Speed Limits and Speed Regulation

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