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CDL · Pulling Doubles and Triples

What is meant by 'longer combination vehicle' (LCV)?

Correct answer

Specifically defined combinations like Rocky Mountain doubles, turnpike doubles, and triples that exceed federal standard length limits and operate under state permits with additional driver requirements

  1. A Any tractor-trailer over 50 feet
  2. B Specifically defined combinations like Rocky Mountain doubles, turnpike doubles, and triples that exceed federal standard length limits and operate under state permits with additional driver requirements
  3. C Any vehicle with more than two trailers
  4. D Vehicles imported from outside North America

Why this is the answer

Longer Combination Vehicles (LCVs) are specifically defined truck combinations that exceed the federal standard length limits. The three main types: Rocky Mountain doubles (one 48-53' trailer plus one 28' trailer); turnpike doubles (two 48-53' trailers); triples (three 28' trailers). LCVs operate primarily on western interstates and certain turnpikes east of the Mississippi where state law and federal grandfathering permits them. LCV drivers must meet additional qualification requirements, complete LCV-specific training, have a minimum experience level, and operate on approved routes only. LCV operations are not allowed on all highways; routes are explicitly authorized.
Source: FMCSA CDL Manual 7.1.7 LCV

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