12.32. What should be the speed when driving at night or in conditions of insufficient visibility?
UAЯкою має бути швидкість під час руху в темну пору доби або в умовах недостатньої видимості?
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This is an exam question from the Traffic Rules of Ukraine concerning the safe choice of speed when road risks increase due to limited visibility. At night and during fog, rain, or snowfall, a driver notices obstacles later, and therefore has less time to react and brake. That is why the traffic rules emphasize not the “usual” numbers from signs, but the actual ability to avoid an accident.
For the theoretical exam, this question tests knowledge of the section of the Traffic Rules about speed, specifically the requirements of clause 12.2, as well as understanding the terms from clause 1.10 (what is considered nighttime and insufficient visibility). The key principle is this: speed is chosen not “by feel” and not only by the permitted limit, but taking into account the section of road the driver can actually see ahead, so that in case of danger, they have enough time to come to a complete stop within that visible distance.
The analysis of the options in this exam question shows a typical mistake: a fixed reduction of 10 km/h does not guarantee safety, because under different conditions (low/high beam, wet surface, ice, fog) the required reduction in speed may be less or much greater. Therefore, the correct approach, established in the Traffic Rules, is that speed must allow stopping within the distance visible to the driver; the combination “1 and 2” is also incorrect, because the first point is not a rule and may mislead when choosing a safe speed.
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 specifically for driving at night or when visibility is limited by weather/twilight, etc. — the speed is chosen so that the braking distance and stopping distance fit within the section of road actually visible to the driver.)
Clause 1.10 (term “Nighttime”)
Nighttime — the part of the day from sunset to sunrise.
Clause 1.10 (term “Insufficient visibility”)
Insufficient visibility — road visibility in the direction of travel of less than 300 m in twilight, fog, rain, snowfall, etc.
Thus, the correct answer is: "Such that the driver is able to stop the vehicle within the visible distance of the road," given that according to the definitions in the Traffic Rules, at night and in conditions of insufficient visibility, the speed is chosen to ensure stopping within the section of road visible to the driver (clause 12.2, taking into account the terms in clause 1.10).
At night (from sunset to sunrise) and in conditions of insufficient visibility (when the road ahead is visible for less than 300 m due to dusk, fog, rain, snow, etc.), the main change for the driver is that you notice danger later. Accordingly, you have less time and distance to react and brake.
Clause 12.2 of the Traffic Rules does not set a fixed speed figure, but rather a principle of safe choice: you must drive in such a way that stopping is possible within the distance you can actually see ahead of you. In other words, if an obstacle appears within the area illuminated by your headlights or that you can distinguish in the fog, your braking distance together with your reaction time must not "go beyond" this visible section.
This is easy to imagine with an example. At night, with low beam headlights, road visibility is less than during the day, and in fog it is reduced even more. If you drive at the same speed as in good visibility, a situation may arise where you notice a pedestrian, a parked car without lights, or another obstacle too late, and even with emergency braking you will not have time to stop before a collision. Therefore, you need to reduce your speed enough to ensure that you have enough distance to come to a complete stop within the visible section of the road.
Thus, the correct answer is "Such that the driver is able to stop the vehicle within the visible distance of the road," because at night and in conditions of insufficient visibility, it is precisely the visible distance that determines the safe speed, which allows you to react in time and come to a complete stop before an obstacle.