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Difficulty: MediumSpeed Control and Following Distance

Under normal weather and road conditions on a dry paved highway, which of the following practices is recommended for establishing and maintaining a safe following distance behind the vehicle ahead?

  1. A
    Maintain a space gap of at least one car length for every 10 mph10\text{ mph} of speed by visually estimating the distance between vehicle bumpers.
  2. Use a stationary landmark to observe when the vehicle ahead passes it, then ensure your vehicle does not pass the same mark before counting at least three seconds.Answer
  3. C
    Maintain the exact posted maximum speed limit regardless of traffic density, assuming that official speed limits guarantee safe spacing.
  4. D
    Reduce the following distance to two seconds when traveling at lower speeds, relying on school zone speed reductions during restricted hours.

Answer

Use a stationary landmark to observe when the vehicle ahead passes it, then ensure your vehicle does not pass the same mark before counting at least three seconds.
The correct response describes the standardized three-second rule method. By selecting a fixed roadside landmark and counting the time elapsed between when the lead vehicle passes it and when your front bumper reaches it, you verify that a minimum three-second spatial cushion is maintained under normal conditions.

Step-by-Step Solution

1
Identify the standard rule for following distance under clear conditions.
Safe driving guidelines recommend the three-second rule for standard passenger vehicles on dry roads.
Three seconds allows adequate perception and braking distance to avoid rear-end collisions.
2
Determine the proper method to measure the time gap.
Pick a stationary object like a signpost or tree on the roadside. When the rear bumper of the leading car passes it, count 'one-thousand-one, one-thousand-two, one-thousand-three'.
Using a fixed landmark provides an accurate measure of temporal gap independent of speed estimation errors.

Key Concept

The Three-Second Rule for Following Distance
Estimated Time:1m 0s
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Topics

Speed Control and Following Distance

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