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Question

Difficulty: EasyNight Driving

When driving a commercial motor vehicle at night, which rule must a driver follow to avoid overdriving the headlights?

  1. A
    Base vehicle speed strictly on brake stopping distance while excluding driver perception and reaction time.
  2. Adjust traveling speed so the vehicle can always come to a complete stop within the distance illuminated by the headlights.Answer
  3. C
    Maintain posted daytime highway speeds as long as following distance behind other vehicles is at least two seconds.
  4. D
    Increase speed in dark areas to quickly close the gap with traffic ahead and rely on their taillights for roadway path guidance.

Answer

Adjust traveling speed so the vehicle can always come to a complete stop within the distance illuminated by the headlights.
According to official CDL guidelines, avoiding overdriving headlights requires operating at a speed that ensures total stopping distance never exceeds the forward distance illuminated by the headlights. With low beams illuminating approximately 250 feet and high beams approximately 350 to 500 feet, vehicle speed must be calibrated so the combination of perception, reaction, and braking distance allows a complete stop within that illuminated envelope.

Step-by-Step Solution

1
Identify the definition and safety risk of overdriving headlights.
Overdriving headlights occurs when total stopping distance exceeds the visible roadway ahead illuminated by the vehicle lights.
If an obstacle appears at the edge of the illuminated zone and stopping distance is too long, a collision is inevitable.
2
Apply the fundamental CDL night speed control principle.
The driver must regulate speed such that total stopping distance (perception + reaction + braking) remains within headlight range.
Ensuring the vehicle can stop within sight distance guarantees the driver has sufficient time and room to avoid unexpected roadway hazards.

Key Concept

Headlight Sight Range and Total Stopping Distance Management
Estimated Time:45s
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Topics

Night Driving

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