1+1=Combination of Vehicles

Its simple math: 1+1=2. Or isn’t it? When a person has a locker which needs to be secured, he employs a lock which is opened with a key, or a combination. Why is it called a combination lock? Because there is more than one number needed to open the device. When multiple objects are together, the singular is lost and the plural is found. This is no different in truck world, but for some reason the difference between a single vehicle and a combination of vehicles eludes both police officers and truckers alike.

First, for purposes of this conversation, the word “vehicle” is very generic. A vehicle is not defined as to whether or not the vehicle is used for commercial purposes. It’s not defined by the requirement for registration. It’s not defined by needing a certain class or endorsement of a driver’s license. It’s defined by whether or not it moves on its own power.

Now stretch and free your mind. Take a single vehicle (represented by the integer “1”) and add it to another single vehicle (also represented by the integer “1”). The sum total of 1+1=2. When this equation is deployed in the vehicle world, there is no longer a single vehicle, but a combination of vehicles. It could be a truck and a trailer, or conversely a trailer and a truck. Either way it is two vehicles.

Interestingly, folk superstars Peter, Paul & Mary had something to say about this in their blockbuster 1969 single, There is Love: “A truck will leave its mother, and a trailer leave its home, and they shall travel on to where the two shall be as one.”

Since the confusion is now clear, here are some practical truck/trailer configuration examples, from easy to hard:

A pickup truck towing a tag trailer

A semi-tractor towing a semi-trailer


An all-terrain crane towing a dolly


To compensate, the carrier will spin the boom backwards and put a three-axle dolly under the boom to spread the weight of load. So there is a power unit (1) and a dolly (1), bringing the sum total of vehicles to 2. This is a combination of vehicles.

“Whoa” says the naysayer. Since the boom is connected to the power unit and now the dolly, this is a single vehicle. Incorrect. These are two separate vehicles. Isn’t this just the reverse of a semi-tractor, semi-trailer combination? In the case of the semi’s, a portion of the weight of the trailer is being carried on the tractor. In the case of the crane, a portion of the weight of the power unit is being carried on the dolly. Combination.

An articulated bus


For the legalists though, it must be made clear an articulated bus, while undeniably a combination of vehicles, is considered a single vehicle in the Federal Motor Carrier Safety Regulations for the purpose of driver’s licensing. This means an operator only has to have a Class-B CDL with a passenger endorsement.

Never let your schooling interfere with your education.


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