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Difficulty: Very hardDriving in Fog and Reduced Visibility

If an expressway has a posted maximum speed limit of 65 mph, a driver traveling at 65 mph through a sudden dense fog bank that restricts forward visibility to 100 feet is complying with traffic law as long as they maintain a four-second following distance and keep their low-beam headlights activated.

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Answer

The statement is false. Maintaining the posted speed limit of 65 mph in dense fog with 100 feet of visibility violates the Basic Speed Law, regardless of following distance or low-beam headlight usage.
The statement is false because the Basic Speed Law overrules posted speed limits during adverse driving conditions. When forward visibility is reduced to 100 feet, traveling at 65 mph is illegal because total stopping distance at that speed is roughly 300 feet, making it impossible to stop for obstacles within the visible path ahead.

Step-by-Step Solution

1
Calculate total stopping distance relative to forward sight distance.
At 65 mph, a standard vehicle requires approximately 300 feet to come to a complete stop (combining perception, reaction, and braking distances), which greatly exceeds the 100-foot visibility distance.
Safe driving principles mandate that a driver must always be able to bring their vehicle to a complete stop within the clear distance visible ahead.
2
Evaluate statutory requirements under the Basic Speed Law.
The Basic Speed Law states that no person shall drive a vehicle at a speed greater than is reasonable or prudent having due regard for weather, visibility, and traffic conditions.
Posted speed limits reflect maximum legal speeds for ideal weather and road conditions only, not adverse conditions like fog.
3
Determine legal compliance of the scenario.
Because 65 mph is unsafe for 100-foot visibility, driving at that speed is a direct violation of traffic law despite proper headlight use and increased following distance.
Compensatory measures like increased following distance do not negate the requirement to lower speed when sight distance is severely impaired.

Key Concept

Basic Speed Law in Reduced Visibility Conditions
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Topics

Driving in Fog and Reduced Visibility

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