9.31. Under what conditions may a flashing red lamp be used instead of an emergency stop sign, according to the Traffic Rules?
UAЗа яких умов миготливий червоний ліхтар може використовуватися замість знака аварійної зупинки, згідно з Правилами дорожнього руху?
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This is a driving exam question from the Traffic Rules of Ukraine concerning road safety during a forced stop or when a vehicle becomes an obstacle. In such situations, the main task of the driver according to the traffic rules is to warn other participants about the danger in advance and unambiguously, so they have time to react and avoid an accident.
The question tests knowledge of the section of the Traffic Rules regarding warning signals and the use of hazard warning lights, specifically the requirements of clause 9.12 (in conjunction with 9.10–9.11) regarding the use of a red flashing light as an alternative to the emergency stop sign. The key requirement of the Traffic Rules: the light must be effective under any conditions, that is, remain clearly visible both on a bright sunny day and when visibility deteriorates (the concept of "insufficient visibility" is defined in clause 1.10 — twilight, fog, rain, snowfall, etc.).
The analysis of answer options in the theoretical exam comes down to the fact that the restrictions "only during the day" or "only in conditions of insufficient visibility" contradict the logic and norm of the Traffic Rules: if the light is lost against the background of the sun or, conversely, is not sufficiently visible in fog or precipitation, it cannot fully replace the emergency stop sign. That is why the correct approach is that the light of the lamp must be clearly visible in both modes — both in daylight and in reduced visibility, because only in this way is timely warning of other drivers ensured.
Clause 9.12
The flashing red light emitted by a lamp, which is used in accordance with the requirements of clauses 9.10 and 9.11 of these Rules, must be clearly visible both during the day in sunny weather and in conditions of insufficient visibility.
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.
That is, the correct answer is: "The light emitted by the lamp must be clearly visible both during the day in sunny weather and in conditions of insufficient visibility," given that according to the definition in the Traffic Rules, clause 9.12 directly establishes such a requirement for the flashing red lamp, and clause 1.10 clarifies what is considered conditions of insufficient visibility.
When a vehicle is forced to stop or becomes an obstacle to traffic, the driver must warn other road users about the danger. According to the rules, either an emergency stop sign or a red flashing light can be used for this purpose, but the light is allowed as a substitute only if it fulfills its main function: it must be clearly visible from a distance.
Clause 9.12 of the Traffic Rules sets a key requirement specifically for the light: its flashing red light must be noticeable not only at night or in fog, but also during the day in bright sunlight. The logic is simple: if the light "gets lost" against the background of daylight or, on the contrary, is not noticeable enough in fog or rain, it does not provide adequate warning and therefore cannot fully replace the sign.
In practice, this means the following: on a sunny day on an open section of road, the light must clearly attract attention, and in conditions of poor visibility (when the road in the direction of travel is less visible, for example due to dusk, fog, or precipitation), this signal should also not blend into the background. Only then will other drivers have enough time to notice the danger in advance and react.
Therefore, the correct answer is: "The light emitted by the lamp must be clearly visible both during the day in sunny weather and in conditions of poor visibility," since the Traffic Rules (clause 9.12) allow the use of a lamp instead of an emergency stop sign only when its flashing red signal is guaranteed to be visible in any lighting and visibility conditions.