59.13. Under what conditions is the operation of a vehicle combination consisting of a bus and a trailer permitted?
UAЗа дотримання яких умов дозволена експлуатація транспортного состава у складі автобуса і причепа?
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This exam question from the Traffic Rules of Ukraine concerns the safe operation of vehicle combinations and the control of the technical condition of the coupling "tractor + trailer." Such norms from the traffic rules directly affect safety: an incorrect or non-standard coupling device increases the risk of the trailer becoming detached, loss of control, and accidents, especially during braking and maneuvering.
The theoretical exam includes checking the section that regulates towing and the operation of combinations (paragraph 23.11 of the Traffic Rules), as well as understanding the very concept of "operation of a vehicle combination" from the definitions in the Traffic Rules (paragraph 1.10). The key logic here is as follows: for a "bus + trailer" combination, there is an additional requirement compared to a regular "car + trailer"—the bus must be equipped with a coupling device that is provided for and installed by the manufacturer, that is, structurally approved for such use.
When evaluating the answer options, the wording about simply a "serviceable coupling device" is insufficient: the Traffic Rules require specifically a factory-installed (or manufacturer-approved) solution, not an arbitrary or homemade tow bar. The statement that towing with buses is always prohibited is also incorrect, because the traffic rules allow such a combination if the special condition from paragraph 23.11 is met. In practice, this means that before departure, you should check not only the technical condition of the coupling and the compatibility of the trailer with the tractor, but also the compliance of the equipment with the manufacturer's requirements and the Traffic Rules of Ukraine.
Clause 23.11
The operation of vehicle combinations consisting of a car, tractor, or other towing vehicle and a trailer is permitted only if the trailer matches the towing vehicle and the requirements for their operation are met, and for vehicle combinations consisting of a bus and a trailer — also if there is a towing device installed by the manufacturer.
Explanation of application: this clause directly establishes an additional condition for the combination "bus + trailer" — the presence of a towing device provided (installed) by the bus manufacturer.
Clause 1.10 (term "Operation of a vehicle combination")
Operation of a vehicle combination — towing a trailer by a towing vehicle in accordance with the instructions for its use (compatibility of the trailer with the towing vehicle, presence of a safety connection, unified signaling system, lighting, etc.).
Explanation of application: the definition of the term clarifies that "operation of a vehicle combination" requires compliance with the requirements for the connection and compatibility of the towing vehicle and trailer, and for a bus, an additional special requirement from clause 23.11 applies.
That is, the correct answer is: "If the bus has a serviceable towing device installed by the manufacturer," given that clause 23.11 of the Traffic Rules directly requires the presence of a towing device installed by the manufacturer for the combination "bus and trailer."
When referring to a vehicle combination, it means the movement of a tractor unit with a trailer as a single connected complex. For this, the Traffic Rules require that such a connection be technically provided for and safe: the trailer must be compatible with the tractor unit, and the operating conditions must be properly met (in particular regarding the connection, signaling, and lighting).
Clause 23.11 of the Traffic Rules specifically highlights the situation with a bus. For regular combinations (car/tractor/other tractor unit with a trailer), the general requirement is the compatibility of the trailer with the tractor unit and compliance with the operating rules. However, for a combination consisting specifically of a bus and a trailer, an additional condition is set: the bus must have a towing device that is provided for and installed by the manufacturer. That is, it is not enough that "it is possible to attach" — it is important that the bus's design officially allows such use.
In practice, this means the following: if a random or homemade tow hitch is installed on the bus, even if the trailer is attached and the lighting equipment works, the operation of such a combination will not meet the requirements of the Traffic Rules. On the other hand, if the bus is equipped with a functional factory-installed towing device, then the basic condition for permitted operation is met.
Thus, the correct answer is "If the bus has a functional towing device installed by the manufacturer," since clause 23.11 of the Traffic Rules establishes a mandatory additional requirement for a bus with a trailer: the presence of a factory (manufacturer-provided) towing device.