12.31. What speed is chosen correctly when driving at night or in conditions of insufficient visibility?
UAЯка швидкість обрана правильно 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 about safe speed at night and in conditions of poor visibility, when the driver can see the road only at a limited distance. In such conditions, danger appears "later," there is less time to react, and the road surface is often worse (rain, snow, fog), so the correct choice of speed directly affects the risk of hitting an obstacle and the severity of the consequences of a traffic accident.
The question tests knowledge of the section of the Traffic Rules regarding driving speed (clause 12.2), as well as understanding of the terms from clause 1.10 "nighttime" and "insufficient visibility." The key criterion from the traffic rules here is not the "permitted number," but the driver's ability to bring the vehicle to a complete stop within the section of the road that is actually visible ahead (illuminated by headlights or within sight).
The correct answer is the option that links speed to the ability to stop within the visible section of the road, because this is exactly how the requirement of clause 12.2 is formulated. Options that refer only to braking distance are incorrect: braking distance does not take into account the driver's reaction time and brake response delay, which means it does not equal stopping distance. In the theoretical exam, it is important not to confuse these concepts: the speed must ensure stopping with consideration of reaction time and actual conditions, otherwise, even with "normal" braking, it may be physically impossible to stop within the visible range.
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.
Brief application: this clause directly establishes the criterion for the “correctly chosen speed” at night or in conditions of insufficient visibility — the ability to stop within the visible distance of the road.
Clause 1.10 (term “Nighttime”)
Nighttime — the part of the day from sunset to sunrise.
Brief application: clarifies when the requirement of clause 12.2 regarding speed selection applies.
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.
Brief application: defines the conditions under which (together with nighttime) the driver is required to choose speed according to the rule of clause 12.2.
That is, the correct answer is "When the driver is able to stop the vehicle within the visible distance of the road," given that according to the Traffic Rules, at night and in conditions of insufficient visibility, the speed must ensure the possibility of stopping within the visible distance of the road (clause 12.2), and the very conditions of "nighttime" and "insufficient visibility" are defined in clause 1.10.
When night falls or visibility deteriorates due to fog, rain, or snow, the driver can see the road at a much shorter distance. This means that a hazard or obstacle may appear in the field of view later than during the day, leaving less time to react. Therefore, in such conditions, speed should not be chosen "out of habit" or only according to the permitted limit—it must be adjusted to the actual visibility.
This is directly stated in clause 12.2 of the Traffic Rules of Ukraine: at night and in conditions of insufficient visibility, the speed must be such that the driver can stop the vehicle within the visible distance of the road. That is, the main criterion for the correct speed is not the number on the speedometer, but the ability to come to a complete stop within the distance you can actually see ahead.
It is important to understand that stopping requires not only the braking distance. The stopping distance is always longer because it also includes the driver's reaction time (the time it takes to notice the obstacle, assess it, and begin braking), as well as the actual braking. Therefore, even if it seems that "the headlights shine far," too high a speed can lead to a situation where you see an obstacle but physically do not have time to stop within the illuminated and visible section.
For example, at night with low beam headlights, your view of the road is limited. If you drive fast, an obstacle (pedestrian, animal, pothole, a stopped vehicle without proper marking) may appear within your visible range too late, and the stopping distance will not be enough. The correctly chosen speed in this situation is such that, upon noticing a hazard within what you can see ahead, you are guaranteed to have enough time to come to a complete stop, without driving "into the darkness."
Therefore, the correct answer is "At which the driver was able to stop the vehicle within the visible distance of the road," because according to clause 12.2 of the Traffic Rules, at night and in conditions of insufficient visibility, the speed must ensure a complete stop within the section of the road that is actually visible to the driver.