Combination vehicles are usually heavier, longer, and require more driving skill than single commercial vehicles. This means that drivers of combination vehicles need more knowledge and skill than drivers of single vehicles. In this section, we talk about some important safety factors that apply specifically to combination vehicles.

This section provides information needed to pass the tests for combination vehicles (tractor-trailer, doubles, triples, straight truck with trailer). The information is only to give you the minimum knowledge needed for driving common combination vehicles. You should also study Section 7 if you need to pass the test for doubles and triples.

The types of vehicles in the combination vehicle classification include: tractor-trailer, doubles, triples and straight trucks with trailers. These “combination vehicles” are usually, heavier, longer and require more driving skill than single commercial vehicles. That means you need more knowledge and skill than drivers of single vehicles.

Attaching more than one trailer to a truck is known as hauling a double (two trailers) or triple (three trailers) and makes the resulting a longer combination vehicle (LCV). This differs from hauling the standard 5-axle semi-trailers in that multiple will be coupled together and led by a …

Longer combination vehicle (LCV) means any combination of a truck-tractor and two or more trailers or semi-trailers, which operate on the National System of Interstate and Defense Highways with a gross vehicle weight (GVW) greater than 36,288 kilograms (80,000 pounds).

Mar 23, 2022 · The doubles and triples endorsement, also called the “T” endorsement, allows holders to drive a semi truck that has multiple trailers attached, sometimes also called a combination vehicle. Drivers who haul double or triple trailers can earn more per mile than those hauling single trailers.

Mar 31, 2004 · The U.S. Department of Transportation's (DOT) Federal Motor Carrier Safety Administration (FMCSA) today announced the first ever minimum training requirements for operators of double and triple trucks, also known as longer combination vehicles (LCVs). The safety agency also established new requirements for instructors who train LCV drivers.

This section provides information needed to pass the tests for combination vehicles (tractor-trailers, doubles, triples, straight trucks with trailers). The information is only to give you the minimum knowledge needed for driving common combination vehicles. You should also study Section 7 if you need to pass the test for doubles and triples.

Doubles and triples are two variants of semi-truck and trailer connections. They’re commonly known as longer combination vehicles (LCVs). As the term suggests, doubles refer to two trailers attached to a single semi-truck. On the other hand, triples refer to three trailers attached to a …

What is a doubles and triples endorsement? A doubles and triples endorsement authorizes a CDL holder to pull multiple trailers at the same time. These unique trailer configurations are also referred to as longer combination vehicles (LCVs). With a “T” endorsement, drivers can pull up to three trailers at once.