247SimpleTests
CDL · Pulling Doubles and Triples

Why must drivers of doubles and triples allow more following distance and avoid quick lane changes?

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 combination needs more room to stop, is harder to maneuver, and sudden steering can crack-the-whip the rear trailer, so extra space and gentle, gradual movements are essential

  1. A Following distance is the same as a single trailer
  2. B Because the long combination needs more room to stop, is harder to maneuver, and sudden steering can crack-the-whip the rear trailer, so extra space and gentle, gradual movements are essential
  3. C The combination is shorter and stops faster
  4. D Quick lane changes are encouraged to clear traffic

Why this is the answer

A doubles or triples combination is long and heavy, so it needs more distance to stop and more room to maneuver than a single trailer. Just as important, abrupt steering inputs are amplified toward the rear and can throw the last trailer out of its lane or tip it over. The driver should keep a large following distance, plan lane changes far ahead with smooth, gradual steering, and avoid sudden swerves or quick corrections. Looking far down the road to anticipate hazards is critical, because the maneuvers needed to avoid a problem must be gentle and made early to keep all the trailers tracking safely.
Source: FMCSA CDL Manual 7.1.3 Lane Changes and Following Distance

Practice more questions

This question is from our CDL Practice Tests practice test. Take the full practice test to test your knowledge across all Pulling Doubles and Triples and other topics.

Take the Doubles and Triples practice test →

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.

New to this exam? Our CDL exam guide explains the format, scoring, and how to prepare.

Related questions

Pulling Doubles and Triples

Why are doubles and triples more prone to rollover than single-trailer combinations?

 Pulling Doubles and Triples

Where should the heaviest trailer be placed in a doubles combination?

 Pulling Doubles and Triples

When changing lanes in a doubles combination, you should:

 Pulling Doubles and Triples

How does following distance for doubles compare to single-trailer combinations?

State-specific guides

Need information for your state? Our state guides cover local requirements, fees, and what to expect on exam day.

California Texas Florida New York Pennsylvania Illinois Ohio Georgia

Recommended study materials

Study guide

CDL Study Guide (Trivium)

Complete prep for all CDL written tests: general knowledge, air brakes, combination vehicles, hazmat, and all endorsements. Includes full-length practice tests.

Check Price → Study guide

CDL Practice Tests & Flashcards (Accepted Inc.)

600+ practice questions covering every FMCSA knowledge area, plus 400 flashcards for endorsement prep.

Check Price → Study guide

Master the CDL Truck Driver's License (Arco)

Arco's classic CDL prep with in-depth FMCSA manual coverage, endorsement chapters, and scored practice exams.

Check Price →

As an Amazon Associate, CJ Affiliate, and AWIN publisher we earn from qualifying purchases. Links above are affiliate links. Full disclosure →