59.11. Along which trajectory does a passenger car trailer move when negotiating a turn?
UAПо якій траєкторії рухається причіп легкового автомобіля при проходженні повороту?
Question without image
This is an exam question from the Traffic Rules of Ukraine concerning safety during maneuvering and changing direction when a car is moving as part of a vehicle combination (car + trailer). In turns, it is important to correctly assess the dimensions and actual trajectory of all parts of the combination in order not to create danger for other road users and to avoid hitting the curb, safety island, or an obstacle on the inside.
The question tests knowledge of sections of the traffic rules related to terminology (point 1.10 "Trailer", "Vehicle Combination"), as well as requirements for safe direction changes (point 10.1) and choosing speed considering the condition of the vehicle (point 12.1). Theoretical exams often include situations where it is important to understand that the trailer does not follow the curve of the towing vehicle in a turn: it has a smaller radius and "cuts" the corner, shifting toward the inside.
The analysis of the options is straightforward according to the logic of movement: the statement about moving farther from the center of the turn is incorrect for the trailer, because the outer trajectory is usually described by the front part of the towing vehicle, while the non-steered wheels of the trailer follow a more inner arc. The option about moving exactly along the trajectory of the car is also incorrect, since the articulated connection and delayed reaction of the trailer change its path. It is correct to understand that in a turn, the trailer shifts closer to the center of the curve, so the driver needs to take a wider path, control the gap on the inside, and choose a safe speed to maintain the stability of the combination.
Clause 1.10 (term "Trailer")
Trailer — a vehicle designed to move in conjunction with a motor vehicle.
Clause 1.10 (term "Combination of vehicles (vehicle combination)")
Combination of vehicles (vehicle combination) — a motor vehicle and trailer(s) connected to each other.
Clause 10.1 — 10 "Starting and changing direction"
Before starting to move, changing lanes, or making any change in direction, the driver must make sure that it will be safe and will not create obstacles or danger to other road users.
Brief application: when turning, the driver is required to take into account that when driving with a combination of vehicles (car + trailer), the actual trajectory of the trailer differs from that of the towing vehicle, so as not to create a hazard (for example, the trailer running over a curb/obstacle on the inside of the turn).
Clause 12.1 — 12 "Speed of movement"
When choosing a safe speed within the established limits, the driver must take into account the road situation, the characteristics of the cargo being transported, and the condition of the vehicle, in order to be able to constantly control its movement and drive it safely.
Brief application: driving with a trailer changes the handling and trajectory in a turn (the trailer "cuts" the corner), so this directly relates to the "condition of the vehicle" and the requirement to drive it safely.
That is, the correct answer is "Closer to the center of the turn than the trajectory of the car," given that according to the definition in the Traffic Rules, the trailer is part of the combination of vehicles, and when changing direction and choosing a safe speed, the driver is required to take into account the peculiarities of handling such a combination: in a turn, the trailer moves along a smaller radius and shifts to the inside of the turn.
When making a turn, a passenger car changes its direction of movement, and its front and rear parts describe an arc of a certain radius. The trailer is attached to the car with a hinge, so it does not "follow" exactly the same arc as the car, but reacts with a delay and with a different radius.
When the car enters a turn, the coupling point is pulled by the car along an outer trajectory, while the trailer wheels, which are not steerable, tend to move in a straighter line relative to their previous direction. As a result, the trailer "cuts" the corner: its wheels pass closer to the inner edge of the turn, that is, closer to the center of the arc than the car's wheels. That is why, when turning with a trailer, the driver needs to pay closer attention to the clearance to the curb, safety island, or other obstacles on the inside of the turn.
This is consistent with the general safety principle set out in the Traffic Rules: the driver is required to operate the vehicle in such a way as not to create danger or obstacles, and to take into account the dimensions and movement characteristics of their vehicle. A car with a trailer actually occupies a different "lane" in the turn: the towing vehicle may take a wide enough path, but the trailer will shift inward and may hit the edge of the road.
Therefore, the correct answer is "Closer to the center of the turn than the trajectory of the car," because in a turn the trailer moves along a smaller radius and "cuts" the arc, shifting to the inside relative to the car's trajectory.