19.12. Under what conditions is it permitted to use the rear fog lamp?
UAУ яких умовах дозволено використовувати задній протитуманний ліхтар?
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This is an exam question from the Traffic Rules of Ukraine concerning road safety and the correct use of external lighting devices. The rear fog lamp has a very bright red light and is not intended for 'better illumination' or ordinary vehicle marking, but so that drivers behind can timely notice the vehicle and assess its direction of movement when visibility is significantly reduced.
The question tests knowledge of the section of the traffic rules regarding the use of external lighting devices (specifically point 19.9 of the Traffic Rules), as well as understanding of the term 'insufficient visibility' from point 1.10. According to the rules, the rear fog lamp is allowed to be used exclusively in conditions of insufficient visibility both during the day and at night (when road visibility in the direction of travel is less than 300 m due to fog, rain, snowfall, twilight, etc.). Therefore, the option about nighttime on unlit sections is incorrect: darkness alone does not give the right to turn on this lamp if visibility is normal. The statement 'in any conditions' is also incorrect, because such a signal can interfere with drivers behind if not needed.
In the theoretical exam, it is important to remember a simple rule: this lamp is turned on only when it is necessary to additionally mark the vehicle due to poor visibility, and turned off as soon as conditions improve. In practice, this helps to avoid dazzling and discomfort for other road users and at the same time increases the visibility of the vehicle in fog or heavy precipitation, which directly affects safety.
Clause 19.9
The rear fog lamp is permitted to be used exclusively in conditions of insufficient visibility, both during daylight and at night.
Clause 1.10 (term “Insufficient visibility”)
Insufficient visibility — road visibility in the direction of travel is less than 300 m in twilight, fog, rain, snowfall, etc.
Clause 19.4
When stopping on the road at night and in conditions of insufficient visibility, parking or side lights must be switched on on the vehicle, and in case of a forced stop, additionally — the hazard warning lights. In conditions of insufficient visibility, it is additionally permitted to switch on dipped headlights or fog lamps and rear fog lamps.
That is, the correct answer is "In conditions of insufficient visibility," considering that according to the definition in the Traffic Rules, the rear fog lamp is allowed to be switched on exclusively when road visibility in the direction of travel is insufficient (less than 300 m in the relevant weather/lighting conditions).
The rear fog lamp is not intended for ordinary marking of the vehicle, but for situations when your vehicle is difficult to see due to poor visibility conditions. It emits a brighter red light than the tail lights so that drivers behind can see the car in time and correctly assess its direction of movement.
Clause 19.9 of the Traffic Rules of Ukraine sets a clear restriction: the rear fog lamp is allowed to be switched on only when there is insufficient visibility. This rule applies both during the day and at night. That is, nighttime alone is not a reason for its use if visibility is normal.
In practice, this means that the rear fog lamp is appropriate, for example, in dense fog, during heavy rain or snowfall, when visibility is significantly reduced. Under normal conditions, it is not switched on, because the excessively bright red light can disturb drivers behind and create unnecessary inconvenience.
Therefore, the correct answer is "In conditions of insufficient visibility," since the Traffic Rules allow the use of the rear fog lamp exclusively for driving or being on the road in situations where, due to poor visibility, it is necessary to additionally mark the vehicle.