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Question

Difficulty: MediumWinter Driving

A commercial driver is preparing for a route where freezing rain and icy conditions are anticipated. When configuring vehicle controls and operating on slippery winter roads, which practice is correct according to commercial driving safety guidelines?

  1. A
    Keep engine retarders active on the highest setting to minimize wear on primary service brakes on slick roads
  2. Disengage engine retarders whenever operating on slippery, icy, or snow-covered road surfacesAnswer
  3. C
    Rely on steer tires with a minimum tread depth of 2/32 inch to provide adequate traction in winter slush
  4. D
    Maintain a standard three-second following distance without adjustments because cold weather does not affect stopping distance

Answer

Disengage engine retarders whenever operating on slippery, icy, or snow-covered road surfaces.
Disengaging the engine retarder on slippery road surfaces prevents the drive wheels from locking and skidding, which is essential to avoid losing directional control and jackknifing on ice or snow.

Step-by-Step Solution

1
Identify the hazards related to wheel traction and auxiliary braking systems during winter driving.
Recognize that snow and ice severely compromise tire grip on the pavement.
Reduced traction means any sudden or uneven wheel braking force can initiate an uncontrolled skid.
2
Evaluate the proper operation of engine retarders on low-traction surfaces according to CDL guidelines.
Determine that retarders apply braking torque solely to the drive axles, which can break traction instantly on ice.
CDL regulations specify that retarder systems must be switched off on wet, icy, or snow-covered roads to prevent jackknifing.

Key Concept

Engine retarder deactivation and vehicle control adjustments on slippery winter road surfaces
Estimated Time:1m 0s
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Topics

Winter Driving

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