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Difficulty: MediumSpeed Limits and Speed Regulation

A motorist is traveling along a rural roadway with a posted maximum speed limit of 55 mph55\text{ mph}. As the vehicle approaches a sharp curve marked with a yellow warning sign displaying an advisory speed plate of 30 mph30\text{ mph} during a moderate rainstorm, which rule dictates the maximum lawful speed for the driver?

  1. The driver must reduce speed to 30 mph30\text{ mph} or lower as needed to maintain safe vehicle control under the Basic Speed Law.Answer
  2. B
    The driver may legally maintain 55 mph55\text{ mph} because maximum speed limit signs always grant permission to travel at that speed regardless of weather or road geometry.
  3. C
    The driver must maintain exactly 30 mph30\text{ mph} because yellow advisory plates set a strict statutory minimum speed limit.
  4. D
    The driver must bring the vehicle to a complete stop before the curve because diamond warning signs carry the legal force of a regulatory stop sign.

Answer

The driver must reduce speed to 30 mph30\text{ mph} or lower as needed to maintain safe vehicle control under the Basic Speed Law.
The correct answer highlights the Basic Speed Law, which mandates driving at a safe, reasonable speed for current conditions. An advisory speed plate alerts drivers to a reduced safe speed for a curve, and wet road surface conditions require additional deceleration to maintain vehicle control.

Step-by-Step Solution

1
Identify the primary traffic safety principle governing vehicle speed during adverse weather and sharp road curves.
Recognize that the Basic Speed Law requires drivers to adjust speed based on road hazards, weather, and visibility, regardless of the posted maximum speed limit.
Posted maximum limits apply only under ideal driving conditions.
2
Evaluate the role of yellow warning signs and advisory speed plates in relation to safe driving practices.
Determine that an advisory plate of 30 mph30\text{ mph} indicates the maximum safe speed for navigating the curve under normal conditions, and rain requires equal or greater caution.
Advisory signs warn drivers of reduced design speeds on specific roadway segments.

Key Concept

Basic Speed Law and Advisory Speed Regulations
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Topics

Speed Limits and Speed Regulation

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