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Difficulty: Very hardSpeed Limits and Speed Regulation

A driver is traveling along an urban arterial street with a posted maximum speed limit of 35 mph35\text{ mph}. Upon approaching a designated school zone, the driver sees a regulatory sign reading "25 mph25\text{ mph} WHEN CHILDREN ARE PRESENT." Children are visibly playing in an enclosed schoolyard separated from the street by a fence, but none are on the sidewalk or near the crosswalk. Simultaneously, a heavy sudden rainstorm creates deep standing water on the asphalt. What is the driver's legal obligation regarding vehicle speed in this situation?

  1. A
    The driver must maintain exactly 35 mph35\text{ mph} because children are behind a fence and posted limits are mandatory minimums.
  2. The driver must reduce speed below 25 mph25\text{ mph} to a rate that is safe for the standing water and hazardous road conditions.Answer
  3. C
    The driver is strictly required to drive at 25 mph25\text{ mph} because children are nearby within the school property grounds.
  4. D
    The driver may legally drive at 35 mph35\text{ mph} as long as windshield wipers are set to maximum speed.

Answer

The driver must reduce speed below 25 mph25\text{ mph} to a rate that is safe for the standing water and hazardous road conditions.
Under the Basic Speed Law, posted speed limits represent maximum allowable speeds under ideal driving conditions. When hazardous conditions exist—such as heavy rain and standing water that present hydroplaning risks—drivers are legally required to reduce their speed to a rate that is safe and prudent for those specific conditions, even if that speed is well below all posted regulatory signs.

Step-by-Step Solution

1
Analyze the posted regulatory speed limits
The standard posted maximum speed limit is 35 mph35\text{ mph}, and the school zone conditional limit is 25 mph25\text{ mph}.
Establishing static regulatory boundaries sets the upper ceiling under normal conditions.
2
Evaluate the Basic Speed Law requirement against current environmental hazards
Standing water creates severe hydroplaning hazards, requiring a speed lower than statutory maximums.
The Basic Speed Law dictates that no person shall drive a vehicle at a speed greater than is reasonable or prudent having due regard for weather, visibility, traffic, and surface conditions.
3
Synthesize the overriding speed regulation rule
Adverse weather and standing water override posted limits, legally obligating the driver to slow to whatever reduced speed ensures control and safety.
Posted speed limits apply only under ideal driving conditions; hazardous conditions require further speed reduction regardless of posted signs.

Key Concept

Basic Speed Law Overrides Posted Maximum Limits in Adverse Conditions
Estimated Time:1m 30s
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Topics

Speed Limits and Speed Regulation

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