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Question

Difficulty: EasySpeed and Road Conditions

When driving a commercial motor vehicle on a roadway that has become wet from rain, traction is significantly reduced. According to standard commercial driving guidelines, how should a driver adjust vehicle speed on a wet road?

  1. A
    Maintain posted highway speed and engage the engine retarder to compensate for reduced traction.
  2. Reduce speed by about one-third of the normal driving speed.Answer
  3. C
    Maintain cruising speed on straight sections and apply firm braking after entering curves.
  4. D
    Maintain regular speed because wet pavement only increases reaction time rather than total stopping distance.

Answer

Reduce speed by about one-third of the normal driving speed.
On wet roads, commercial drivers must reduce their speed by approximately one-third (for instance, slowing from 55 mph down to about 35 mph) to maintain vehicle control and compensate for longer braking distances.

Step-by-Step Solution

1
Identify the specific road surface condition described in the scenario.
The roadway is wet due to rainfall.
Different surface conditions dictate specific standardized speed adjustments in commercial driving.
2
Apply the official commercial driving speed adjustment rule for wet pavement.
Speed should be reduced by approximately one-third (e.g., from 55 mph down to about 35 mph).
Traction on wet pavement is reduced, requiring lower vehicle speeds to maintain steering control and manageable braking distances.

Key Concept

Speed reduction guidelines for wet road conditions
Estimated Time:45s
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Topics

Speed and Road Conditions

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