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Difficulty: MediumSpeed Control and Following Distance

You are driving behind a large commercial truck on a two-lane road during a rainstorm as you enter a school zone with active flashing lights displaying a 20 mph20\text{ mph} limit. The standard posted speed limit for this road segment is normally 35 mph35\text{ mph}. Under these combined road and weather conditions, how should you legally and safely adjust your speed and following distance?

  1. Reduce your speed to 20 mph20\text{ mph} or lower to obey the active school zone speed limit and Basic Speed Law, while increasing your following distance to at least 4 to 5 seconds.Answer
  2. B
    Maintain 35 mph35\text{ mph} as long as no children are physically present on the sidewalks or crosswalks at that exact moment.
  3. C
    Reduce your speed to 20 mph20\text{ mph} to comply with the school zone, but maintain the standard 3-second following distance behind the truck.
  4. D
    Drive at 35 mph35\text{ mph} while increasing your following distance to 5 seconds, assuming the additional gap safely compensates for traveling above the school zone limit.

Answer

Reduce your speed to 20 mph20\text{ mph} or lower to obey the active school zone speed limit and Basic Speed Law, while increasing your following distance to at least 4 to 5 seconds.
The correct response recognizes two essential safety principles: active school zone flashing lights require an immediate reduction to the posted speed limit (20 mph20\text{ mph}), and wet roads combined with trailing a large truck necessitate expanding the following distance buffer beyond the standard 3-second minimum to 4 seconds or more.

Step-by-Step Solution

1
Determine the legal speed limit based on active zone signs and road conditions
The speed limit drops to 20 mph20\text{ mph} due to the active flashing school zone lights, and may need to be lower if rain severely impairs traction.
Traffic law dictates that active school zone signals supersede regular posted limits, and the Basic Speed Law mandates driving at a safe speed for current weather conditions.
2
Evaluate required following distance behind a large commercial vehicle on wet pavement
Increase following distance from the standard 3 seconds to 4-5 seconds or more.
Large trucks block forward line-of-sight, and wet road surfaces significantly increase vehicle braking distances.

Key Concept

Combining reduced school zone speed limits and expanded following distances for adverse weather and heavy vehicles
Estimated Time:1m 0s
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Topics

Speed Control and Following Distance

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