Question 71 of 120

Why do federal and state rules restrict which roads doubles and triples combinations may use?

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Restrictions apply only to combinations hauling hazardous materials
Restrictions are based solely on the trailers' paint color
There are no restrictions on where doubles and triples combinations can travel in the country regardless of size or road conditions
The added length and handling characteristics make some roads unsafe or impractical for these combinations

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Correct answer to question 71 (Doubles/Triples): The added length and handling characteristics make some roads unsafe or impractical for these combinations

Why

Because doubles and triples combinations are longer and handle differently than single trailers, certain roads, ramps, and routes may be restricted or prohibited to keep these combinations on roads suited to their size.

Updated: November 2026

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Why do federal and state rules restrict which roads doubles and triples combinations may use?

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