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Combination Vehicles

USA Fleet Supply offers a full line of CDL Combination Vehicles training products. What is considered a Combination, or Long Combination Vehicle? Long combination vehicles are combinations of multiple Trailers on tractor trucks as compared to standard 5 axle semi trailer-trucks with one trailer. A Combination Vehicle is an equipment configuration which includes separate power unit (tractor) and at least one trailer. One that articulates. It has joined sections that can move independently of each other.

Examples of Long Combination vehicles can be found here.

LCVs are useful because they usually carry extra freight in terms of square and cubic feet capacity as well as weight capacity. Because of the extra axles it spreads out the weight across a longer area. They're also more efficient based on Ton-mileage.

In the United States some states allow certain combinations on certain routes. In the western United States LCVs are allowed on many Interstate highways. The only LCVs allowed nationwide are STAA doubles.

View our full line of CDL Combination Vehicles Products

Combination Vehicles Test Question and Answer Download Booklet

The "Original", most popular and the most downloaded Combination Vehicles Test Question and Answer Booklet on the web. These test questions and answers are updated annually. This booklet contains the latest up-to-date Combination Vehicles Test Questions and Answers.

You will need a Combination Vehicles endorsement on any commercial vehicle that pulls one or more trailers. Download this Combination Vehicles test question and answer study guide and you will have all of the questions and answers in front of you at all times, on your PC or in print.

The minimum length that States must allow for trailers and semi-trailers in these combinations is 8.53 m (28 feet). States must also allow the continued use of semi-trailers 8.69 m (28 feet 6 inches) long that were in use on December 1, 1982, provided the overall length of the combination does not exceed 19.81 m (65 feet). The maximum overall length of cargo-carrying units that States may allow for twin trailer combinations when one trailing unit is longer than 28.5 feet is determined by the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA).

A "B-train" is a truck tractor-semi-trailer-semi-trailer combination. In this combination, the two trailing units are connected by a fifth wheel attached to a frame under the first semi-trailer that extends beyond the rear of that semi-trailer (the so-called "B-train" hitch). The second semi-trailer connects to the first at this fifth wheel. B-train combinations are subject to the same length limits (65 feet) as truck tractor-semi-trailer-trailer combinations. When no semi-trailer is attached to the B-train hitch, the assembly is included in the length measurement of the first semi-trailer, and the 14.63 m (48-foot), or grandfathered, length applies.


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