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Difficulty: MediumDriving in Adverse Weather and Low Visibility

You are traveling along a rural two-lane highway at dusk when a sudden torrential downpour severely limits visibility and causes water to accumulate on the road surface. The posted speed limit is 55 mph55\text{ mph}. Under the Basic Speed Law and adverse weather safety rules, which of the following driving actions should you take?

  1. Reduce your speed below 55 mph55\text{ mph} to suit the low visibility and road traction, while switching on your low-beam headlights.Answer
  2. B
    Maintain your speed at the posted 55 mph55\text{ mph} limit as long as you stay strictly within your marked lane.
  3. C
    Activate your high-beam headlights to project maximum light through the falling rain.
  4. D
    Apply the brakes firmly and repeatedly whenever driving over standing water to prevent tires from floating.

Answer

The driver should reduce speed below the posted limit to match the reduced traction and visibility, and turn on low-beam headlights.
The correct response requires adjusting speed downward below the posted limit to comply with the Basic Speed Law when rain and darkness impair visibility and traction. Additionally, low-beam headlights enhance visibility without causing reflective glare.

Step-by-Step Solution

1
Evaluate environmental hazards and legal speed duties
Identify that torrential rain at dusk reduces visibility and traction below conditions suited for the posted 55 mph55\text{ mph} limit.
The Basic Speed Law mandates driving at a safe speed based on current visibility and road surface conditions, regardless of posted maximums.
2
Select appropriate lighting for heavy rain and low daylight
Activate low-beam headlights.
Low beams illuminate the path without causing glare from light reflecting off raindrops, while making your vehicle visible to surrounding drivers.

Key Concept

Basic Speed Law and Proper Headlight Usage in Adverse Weather
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Topics

Driving in Adverse Weather and Low Visibility

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