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CDL · Pulling Doubles and Triples

Why are doubles and triples especially sensitive to crosswinds and require caution on exit ramps and curves?

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

Because the long, articulated combination and high empty trailers can be pushed by wind, and the amplified swing of the rear trailers makes ramps and curves taken too fast a major rollover risk

  1. A Because the long, articulated combination and high empty trailers can be pushed by wind, and the amplified swing of the rear trailers makes ramps and curves taken too fast a major rollover risk
  2. B They are immune to wind
  3. C Ramps and curves pose no special risk
  4. D Wind only affects the tractor

Why this is the answer

The tall, light trailers in a doubles or triples set present a large surface to crosswinds, which can push the trailers and require steering correction — and any sharp correction risks cracking the whip. On exit ramps and curves, the combination's articulation and rearward amplification mean the back trailer can roll over even when the tractor feels stable, so posted ramp speeds (set for cars) are far too fast. The driver should slow well before ramps and curves, steer smoothly, and be ready for wind gusts on open stretches, bridges, and when passing or being passed by large vehicles.
Source: FMCSA CDL Manual 7.1.5 Crosswinds, Ramps and Curves

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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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