12.15. The speed of movement at night and in conditions of insufficient visibility must be such that the driver:
UAШвидкість руху в темну пору доби та в умовах недостатньої видимості повинна бути такою, щоб водій:
This is a driving exam question from the Traffic Rules of Ukraine about safe speed at night and in conditions of insufficient visibility. At night, in fog, rain, or snowfall, the driver sees the road worse, notices obstacles later, and judges distances less accurately, so the usual daytime speed can become dangerous. That is why the traffic rules require choosing the driving speed not "by eye," but taking into account actual visibility and stopping distance.
The question tests knowledge of the section of the Traffic Rules about speed (paragraph 12.2), as well as understanding of the terms from paragraph 1.10 ("nighttime," "insufficient visibility"). This logic is often included in the theoretical exam: the speed must be such that the driver is guaranteed to be able to stop the vehicle within the visible section of the road. That is, if an obstacle appears at the edge of visibility, there must be enough time to react and brake.
The analysis of the answer options comes down to the fact that tying it to a fixed 50–100 m is incorrect: visibility in different conditions may be less (dense fog) or much greater (straight section of road with high beams), so such a "norm" does not correspond to the wording of the Traffic Rules. The correct criterion is "within the visible section of the road," because it is universal and is directly stated in paragraph 12.2: safe speed is determined not by a number, but by the ability to stop within the distance the driver can actually see in specific road conditions.
Clause 12.2
At night and in conditions of insufficient visibility, the speed must be such that the driver is able to stop the vehicle within the visible distance of the road.
Application: this clause directly establishes the requirement for choosing speed at night and/or in poor visibility — the stopping distance (including driver reaction time) must not exceed the distance of the road visible to the driver.
Clause 1.10 (term "Night time")
Night time — the part of the day from sunset to sunrise.
Application: defines the time conditions under which the special requirement of clause 12.2 regarding speed selection applies.
Clause 1.10 (term "Insufficient visibility")
Insufficient visibility — road visibility in the direction of travel less than 300 m in twilight, fog, rain, snowfall, etc.
Application: defines the road/weather conditions under which the driver is required to choose such a speed as to be guaranteed to stop within the visible distance of the road (requirement of clause 12.2).
That is, the correct answer is "Able to stop the vehicle within the visible distance of the road," given that according to the definition of the Traffic Rules, at night and in insufficient visibility, the speed must ensure the ability to stop within the section of the road visible to the driver (clause 12.2).
At night (from sunset to sunrise) and in conditions of insufficient visibility (when the road in the direction of travel is visible for less than approximately 300 m due to dusk, fog, rain, snow, etc.), the driver objectively receives less information about the situation ahead. Obstacles, pedestrians, road irregularities, or stopped vehicles may become visible much later than during the day, so the usual daytime speed can become dangerous.
That is why clause 12.2 of the Traffic Rules of Ukraine does not set “specific kilometers per hour,” but rather a rule for choosing a safe speed: in such conditions, the speed must be chosen so that the driver can stop the vehicle within the distance they can actually see the road. The logic is simple: if an obstacle appears at the limit of visibility, the driver must have enough time to react and brake to avoid a collision.
For example, at night with low beams, the illuminated section of the road may be relatively short. If you drive too fast, the vehicle will cover this visible section faster than the driver can react and stop. Similarly, in fog: even at the permitted speed, limited visibility may require a significant reduction in speed, otherwise the stopping distance will be longer than the distance over which the driver can see the road.
Note that the requirement is not tied to a fixed 50–100 meters. Visibility may vary depending on weather, road profile, lighting, and headlight mode, so the safe speed is always determined by the ability to stop in time within the visible area.
Therefore, the correct answer is "To be able to stop the vehicle within the visible distance of the road," since according to clause 12.2 of the Traffic Rules, at night and in conditions of insufficient visibility, the speed is chosen so that the stopping distance does not exceed the distance over which the driver can see the road ahead.