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Question

Difficulty: MediumDriving in Adverse Weather and Low Visibility

While driving on a suburban road during a sudden heavy downpour with standing water on the pavement, how should you adjust your vehicle speed and equipment to maintain safe control?

  1. Reduce your speed below the posted limit to match road conditions and turn on low-beam headlights.Answer
  2. B
    Maintain the posted speed limit as long as no vehicles are ahead, while activating high-beam headlights for maximum visibility.
  3. C
    Maintain your speed but pump your brakes continuously while driving through standing water to prevent hydroplaning.
  4. D
    Increase your speed slightly to pass through the storm area quickly while using hazard flashers as your main light source.

Answer

Reduce your speed below the posted limit to match road conditions and turn on low-beam headlights.
Under the Basic Speed Law, drivers must reduce speed to what is reasonable and prudent for existing road conditions. Heavy rain reduces surface friction and visibility, making the posted limit unsafe. Using low-beam headlights illuminates the roadway while preventing the harsh reflection glare caused when high beams strike falling water droplets.

Step-by-Step Solution

1
Assess environmental hazards
Recognize that standing water reduces tire traction (creating hydroplaning risk) and rain lowers visibility.
Safe driving requires adjusting vehicle operation to match current hazards.
2
Apply the Basic Speed Law
Slow down below the posted numerical speed limit.
Posted speed limits are established for ideal weather conditions with dry pavement.
3
Select proper vehicle equipment
Turn on low-beam headlights.
Low beams illuminate the road ahead without bouncing glare back into the driver's eyes off airborne moisture.

Key Concept

Basic Speed Law and Vehicle Equipment Adaptation in Severe Weather
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Topics

Driving in Adverse Weather and Low Visibility

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