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CDL · Pulling Doubles and Triples

Why should you avoid driving doubles in strong crosswinds?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

Strong crosswinds can push the rear trailer of doubles or triples sideways out of the lane and even initiate rollover

  1. A Strong crosswinds can push the rear trailer of doubles or triples sideways out of the lane and even initiate rollover
  2. B Crosswinds increase fuel consumption only
  3. C Crosswinds are not a concern for doubles
  4. D Crosswinds only affect tractors

Why this is the answer

Doubles and triples present large flat sides that wind pushes against, and the rearward amplification effect applies to wind-induced movement too. A strong gust acting on the rear trailer can swing it across lanes or, in extreme cases, contribute to rollover. Empty or lightly-loaded trailers are most vulnerable because there is little weight to keep the wheels planted. In high winds, slow down, increase following distance, and grip the steering wheel firmly to maintain control as the combination is pushed. On certain bridges and highway sections in known windy areas, posted advisory speeds for high-profile vehicles or temporary closures of doubles operation may apply.
Source: FMCSA CDL Manual 7.1.5 Crosswinds

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About this topic: Pulling Doubles and Triples

Pulling doubles and triples means managing the most unstable combination on the road: the rear trailer whips, rolls and jackknifes more easily, following distance must grow, and the sequence of air-line and brake checks is longer. These questions cover the handling rules specific to multiple trailers. This is one of 29 Doubles and Triples questions on pulling doubles and triples, each with a full explanation on a single study page.

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