59.3. When driving a vehicle with a trailer, what actions should you take to prevent it from overturning?
UAРухаючись на автомобілі з причепом, які дії Ви повинні виконати, щоб запобігти його перекидання?
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This is an exam question from the Traffic Rules of Ukraine about the safety of driving a road train (a car with a trailer) in turns. It reminds that due to inertia and lateral forces, a trailer can start to sway or lose stability, and overturning often causes the car itself to overturn as well. Therefore, for the driver, the key is to control speed and make smooth maneuvers to maintain control and not create danger for other road users.
The question tests knowledge of Section 12 "Speed of Movement" (primarily clause 12.1 on choosing a safe speed taking into account road conditions, vehicle and cargo condition), and is also related to Section 10 "Starting and Changing Direction" (clause 10.1 on the safety of maneuvers) and the driver's duties from Section 2 (clause 2.3 regarding attentiveness and control of technical condition and cargo). In the context of the theoretical traffic rules exam, this means: before a turn, speed must be reduced in advance, so as to enter the curve smoothly and without overloading the trailer with lateral acceleration.
The correct option is to reduce speed before entering the turn, because lower speed reduces the lateral load on the trailer's wheels, decreases the risk of being "carried out" to the outside and swaying. The option to increase speed is dangerous, as it sharply increases lateral forces and the chance of skidding or overturning. The option "do not change speed" is also incorrect: the safe speed for turning with a trailer is usually lower than without it, and should be chosen taking into account the radius, surface, irregularities, and the trailer's load.
Clause 12.1 (Section 12 "Speed of movement")
When choosing a safe speed within the established limits, the driver must take into account the road situation, as well as 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.
Explanation: a trailer increases the risk of skidding/swaying and overturning in a turn, so the safe speed before a turn should be lower than without a trailer.
Clause 10.1 (Section 10 "Starting off and changing direction")
Before starting off, changing lanes, turning, making a U-turn, stopping, and parking, the driver must make sure that it will be safe and will not create obstacles or danger to other road users.
Explanation: a safe turn with a trailer requires advance preparation of the maneuver, in particular, reducing speed before entering the turn to avoid creating danger (including possible trailer overturning).
Clause 2.3 (Section 2 "Duties and rights of drivers of motor vehicles")
To ensure road safety, the driver is obliged to be attentive, monitor the road situation, respond appropriately to its changes, monitor the correct placement and securing of the cargo, the technical condition of the vehicle, and not be distracted from driving while on the road.
Explanation: monitoring the technical condition, the cargo/stability of the road train, and timely response to a turn as a change in the road situation are directly related to the need to reduce speed in advance.
Clause 12.3 (Section 12 "Speed of movement")
If there is a danger to traffic or an obstacle that the driver can objectively detect, he must immediately take measures to reduce speed up to stopping the vehicle or safely bypassing the obstacle for other road users.
Explanation: if a turn (its small radius, unevenness, slippery surface) creates a danger of loss of trailer stability, the driver is obliged to reduce speed.
That is, the correct answer is "Reduce speed when entering a turn," given that according to the Traffic Rules, the driver must choose a safe speed taking into account the condition of the vehicle and cargo, and ensure the safety of the turning maneuver by reducing speed in advance to constantly control the movement of the road train.
When driving with a trailer, the vehicle becomes less stable in turns. The trailer has inertia and tends to continue moving straight, so lateral forces act on it along the curve of the turn. If the speed is too high, these forces increase to the point where the trailer may start to sway, "jackknife" the coupling, or even overturn. The danger is that the trailer overturning often pulls the vehicle over as well.
The traffic rules require the driver to choose a safe speed taking into account the road situation, surface condition, visibility, and the characteristics of the cargo and vehicle. For a road train (vehicle with a trailer), this means that the speed should be reduced in advance before a turn, so as to enter the turn without overloading the trailer with lateral acceleration and without the need for sudden braking while already in the curve.
Practical example: if you approach a long or sharp turn with a trailer and enter it at the same speed as without a trailer, the trailer may swing outward, begin to sway, and on uneven surfaces or with a sharp steering movement, the risk of overturning increases dramatically. In contrast, reducing speed in advance makes the turn much "calmer": steering becomes smoother, the lateral load on the trailer wheels decreases, and the trailer does not try to push the vehicle off its trajectory.
Therefore, the correct answer is "Reduce speed when entering the turn," because lowering speed before the turn reduces the effect of lateral forces on the trailer and prevents it from swaying and overturning.