Examkin

Question

Difficulty: MediumSpeed Control and Following Distance

A driver is traveling on a highway with a posted speed limit of 55 mph55\text{ mph}. Sudden heavy rainfall reduces visibility and creates standing water on the pavement. Under safe driving practices and the Basic Speed Law, how should the driver adjust their speed and following distance?

  1. Reduce speed below 55 mph55\text{ mph} to suit the hazardous road conditions and increase the following distance to four seconds or more.Answer
  2. B
    Maintain the posted speed limit of 55 mph55\text{ mph} while keeping the standard three-second following distance, as posted limits represent legally safe speeds.
  3. C
    Maintain 55 mph55\text{ mph} but reduce the following distance to two seconds to stay close to the leading vehicle's taillights for better guidance.
  4. D
    Increase speed slightly to pass through the rainstorm quickly while keeping a standard three-second following distance.

Answer

The driver must reduce their speed below the posted 55 mph55\text{ mph} limit and increase their following distance to at least four seconds to account for reduced traction and visibility.
The correct response recognizes that heavy rain reduces tire grip and visibility. According to the Basic Speed Law, drivers must adjust their speed below posted limits when conditions become dangerous and extend their following space to at least four seconds to allow safe stopping margins.

Step-by-Step Solution

1
Evaluate environmental hazards and road conditions.
Heavy rain lowers tire traction on wet pavement and reduces forward visibility.
Vehicle stopping distance significantly increases on slippery surfaces.
2
Apply the Basic Speed Law.
Select a safe speed that is lower than the posted maximum speed limit of 55 mph55\text{ mph}.
Posted speed limits apply to ideal driving conditions, not hazardous weather.
3
Adjust following distance relative to the vehicle ahead.
Increase the standard 3-second buffer to 4 seconds or more.
An increased safety margin provides necessary reaction time and braking distance on wet roads.

Key Concept

Speed adjustment under adverse weather conditions and expansion of following distance under the Basic Speed Law.
Rate this question

Topics

Speed Control and Following Distance

More questions from this topic