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Difficulty: Very hardDriving in Fog and Reduced Visibility

While descending a steep mountain grade, a driver encounters sudden thick valley fog mixed with heavy mist, reducing forward sight distance to under 50 feet. Moisture rapidly accumulates on the windshield, and a tailgating vehicle is following closely behind. Under safe driving practices and traffic laws, which combination of actions should the driver execute?

  1. Gradually reduce speed, turn on low-beam headlights and windshield wipers, signal early, and exit the roadway completely at a safe location before engaging emergency hazard flashers.Answer
  2. B
    Maintain the posted speed limit to avoid being rear-ended, while switching on high-beam headlights to maximize illumination through the heavy mist.
  3. C
    Activate high-beam headlights to penetrate the fog and tap the brakes repeatedly while staying in the travel lane to force the tailgating driver to slow down.
  4. D
    Brake abruptly to come to a stop inside the rightmost lane and turn on hazard lights until visibility improves.

Answer

The correct action is to gradually reduce speed, use low-beam headlights and windshield wipers, signal intent early, and pull completely off the traveled portion of the roadway before turning on hazard flashers.
The option advocating gradual deceleration, low-beam headlights, wipers, and pulling completely off the roadway before activating hazard flashers correctly follows all safety guidelines for severe reduced-visibility hazard management.

Step-by-Step Solution

1
Adjust speed and vehicle controls for reduced visibility
Driver decelerates smoothly, turns on wipers, and activates low-beam headlights (or fog lights) to prevent light reflection glare.
High beams reflect off moisture droplets back into the driver's eyes, while low beams cast light downward onto the road surface.
2
Manage trailing traffic safely
Driver avoids sudden braking so the tailgating vehicle behind has adequate time to react and slow down.
Abrupt stops in reduced visibility frequently cause rear-end multi-vehicle crashes.
3
Locate a safe stopping area off the roadway
Driver signals early and pulls completely off the paved roadway, past the shoulder into a rest stop, parking lot, or turnout.
Stopping on the travel lane or narrow shoulder leaves the vehicle exposed to oncoming traffic that cannot see it in time.
4
Secure the vehicle while stopped
Once parked safely off the road, the driver turns on emergency hazard flashers and turns off standard headlights.
Leaving headlights on while parked near the road can mislead other drivers into following your lights off the road.

Key Concept

Driving in Fog and Reduced Visibility
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Topics

Driving in Fog and Reduced Visibility

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