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Difficulty: Very hardSpeed Control and Following Distance

You are driving a passenger vehicle at 50 mph50\text{ mph} on a wet two-lane highway where the posted speed limit is 50 mph50\text{ mph}. You are traveling behind a large commercial truck, and another vehicle is tailgating your car closely from behind. As visibility decreases due to rainfall, which combination of speed control and following distance adjustments represents the safest application of driving principles?

  1. Gradually reduce your speed below 50 mph50\text{ mph} and increase your following distance behind the commercial truck to at least 55 to 66 seconds, creating an adequate space cushion ahead.Answer
  2. B
    Maintain your speed at 50 mph50\text{ mph} because the Basic Speed Law grants legal protection to drive at the posted limit under all environmental conditions.
  3. C
    Maintain 50 mph50\text{ mph} and reduce your following distance to 22 seconds behind the truck to discourage other vehicles from attempting unsafe passing maneuvers.
  4. D
    Maintain 50 mph50\text{ mph} and a standard 3-second distance, as speed reductions on highways are strictly reserved for active school zone beacon indicators.

Answer

Gradually reduce your speed below 50 mph50\text{ mph} and increase your following distance behind the commercial truck to at least 55 to 66 seconds, creating an adequate space cushion ahead.
Under the Basic Speed Law, drivers must adjust speed according to road, weather, and traffic conditions. When driving on wet roads with reduced visibility, trailing a large truck, and being tailgated, reducing speed below the posted maximum and extending following distance to at least 5 to 6 seconds creates an essential safety buffer ahead, preventing the need for hard braking that could lead to a rear-end collision from behind.

Step-by-Step Solution

1
Analyze environmental and traffic hazards present in the scenario.
Identified adverse weather (wet road/reduced visibility), a large vehicle ahead blocking vision, and a tailgating driver behind.
Multiple simultaneous risk factors require compounding defensive driving precautions.
2
Apply the Basic Speed Law to the posted speed limit of 50 mph50\text{ mph}.
Determine that driving at the posted limit of 50 mph50\text{ mph} is excessive for wet surface traction and low visibility.
The Basic Speed Law prohibits driving faster than is safe for existing conditions regardless of posted signs.
3
Calculate the necessary following distance behind the commercial truck.
Increase following distance from the standard 33 seconds to 55 or 66 seconds.
Additional space is needed due to wet pavement stopping distances and to absorb sudden stops smoothly for the tailgater behind.

Key Concept

Basic Speed Law and Extended Following Distance in Adverse Conditions
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Topics

Speed Control and Following Distance

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