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Difficulty: EasyFreeway, Highway, and Expressway Driving Rules

You are driving on a freeway with a posted maximum speed limit of 65 mph. Dense fog rapidly enters the area, reducing your visibility to less than 100 feet. According to traffic laws, what is the maximum speed at which you should drive under these conditions?

  1. A safe speed suited to the reduced visibility, even if it is far below 65 mph.Answer
  2. B
    Exactly 65 mph, because driving below the posted maximum on a freeway is always prohibited.
  3. C
    75 mph, to exit the foggy section of the freeway as quickly as possible.
  4. D
    Exactly 55 mph, because traffic laws automatically lower all freeway speed limits by 10 mph during weather events.

Answer

A safe speed suited to the reduced visibility, even if it is far below 65 mph.
The correct option correctly applies the Basic Speed Law, which mandates that drivers adjust speed downward during adverse weather or low visibility to ensure safe operation, regardless of the posted maximum speed limit.

Step-by-Step Solution

1
Identify the environmental condition and rule in effect.
Dense fog reduces visibility, activating the Basic Speed Law.
Posted speed limits reflect maximum speeds permissible under ideal weather and traffic conditions.
2
Determine the legal speed requirement.
Drivers must slow down to a speed that allows adequate stopping distance for limited visibility.
The Basic Speed Law dictates driving at a safe speed relative to current hazards, regardless of the maximum limit posted.

Key Concept

Basic Speed Law on Freeways and Adverse Weather Regulations
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Topics

Freeway, Highway, and Expressway Driving Rules

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