12.34. How should a driver act in case of a traffic hazard or obstacle detected while driving?
UAЯк повинен вчинити водій у разі виникнення небезпеки для руху або перешкоди, яку він виявив під час руху?
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This is an exam question from the Traffic Rules of Ukraine about the basic principle of road safety: how a driver should act when the traffic situation suddenly changes or an obstacle appears in the lane. In practice, the ability to react quickly and correctly to danger reduces the risk of accidents, which is why this topic regularly appears on the theoretical exam and tests not “theory for the sake of theory,” but the real algorithm of actions in a critical moment.
The question belongs to section 12 of the Traffic Rules (Speed of Movement) and is based on clause 12.3, as well as the definitions from clause 1.10 (“danger to traffic” and “obstacle to traffic”). The logic of the Traffic Rules is as follows: if the driver could objectively notice the threat, they are obliged to react immediately, and the primary and universal way to increase control over the situation is to reduce speed up to a complete stop. An alternative is allowed only if it does not create a new threat for other participants, that is, a safe detour is possible.
The analysis of the answer options in this exam task shows typical mistakes. The idea of “continuing to drive without changing speed, but being ready to stop” contradicts the requirement to immediately reduce speed: waiting takes time and increases the braking distance. The wording about reducing speed up to a stop or a safe detour accurately reflects the content of clause 12.3 of the Traffic Rules of Ukraine, so it is correct. And the option “both answers are correct” is not suitable, because the first action does not comply with the traffic rules and in fact replaces the obligation to react “immediately” with “if necessary.”
Clause 12.3
In case of a danger to traffic or an obstacle that the driver is objectively able to detect, he must immediately take measures to reduce speed up to a complete stop of the vehicle or a safe detour of the obstacle for other road users.
Clause 1.10 (term “Danger to traffic”)
Danger to traffic — a change in the road situation (including the appearance of a moving object approaching the lane of the vehicle or crossing it) or the technical condition of the vehicle, which threatens road safety and forces the driver to immediately reduce speed or stop. A specific case of danger to traffic is the movement within the lane of the vehicle of another vehicle moving against the general flow.
Clause 1.10 (term “Obstacle to traffic”)
Obstacle to traffic — a stationary object within the lane of the vehicle or an object moving in the same direction within this lane (except for a vehicle moving against the general flow of vehicles) and forces the driver to maneuver or reduce speed up to stopping the vehicle.
That is, the correct answer is "Take measures to reduce speed up to stopping the vehicle or safely detouring the obstacle for other road users," given that according to the definition of the Traffic Rules, danger/obstacle forces the driver to react immediately, and clause 12.3 directly obliges to reduce speed up to a complete stop or perform a safe detour.
While driving, the driver constantly assesses the traffic situation. If a danger to traffic suddenly appears (for example, a pedestrian steps onto the roadway, the car ahead brakes sharply, another vehicle enters the lane) or an obstacle arises (for example, a stationary object on the lane, a pothole, spilled cargo), this means that the normal driving mode is no longer safe.
The Traffic Rules distinguish these situations as follows: a danger to traffic is a change in the situation or the condition of the vehicle that poses a real threat to safety and requires the driver to react immediately; an obstacle is an object within the lane that forces the driver to either maneuver or reduce speed up to a complete stop. The key point in both definitions is that the driver must react as soon as they could objectively notice it.
That is why clause 12.3 of the Traffic Rules establishes a clear algorithm of actions: upon detecting a danger or obstacle, the driver does not have the right to "continue as before" or hope that everything will be fine. The correct reaction is to immediately reduce speed enough to control the situation, and if necessary, bring the vehicle to a complete stop. For example, if an open manhole appears on the road or the car ahead stops—the first action should be braking, as it provides time to assess and reduces the consequences of a possible collision.
If stopping is not the only solution and there is a real opportunity to avoid the obstacle by maneuvering, the Traffic Rules allow for bypassing, but only if it is safe for other road users. That is, the driver must make sure that when bypassing, they do not create a danger for those moving nearby or oncoming, and do not provoke an accident. For example, bypassing an object on the lane is allowed only when it does not force other drivers to brake sharply or change direction.
Therefore, the correct answer is "Take measures to reduce speed up to stopping the vehicle or safely bypassing the obstacle for other road users," since clause 12.3 of the Traffic Rules obliges the driver, in case of danger or obstacle that they could detect, to immediately reduce speed to a stop or perform a safe bypass.