19.20. Which external devices must the driver of a motor vehicle switch on when entering any tunnel, regardless of its level of illumination?
UAЯкі зовнішні пристрої повинен ввімкнути водій механічного транспортного засобу при в'їзді в будь-який тунель, незалежно від ступеня його освітлення?
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This is an exam question from the Traffic Rules of Ukraine about safe driving in tunnels and the correct use of external lighting devices. In a tunnel, the perception of the environment changes sharply (eye adaptation at entry and exit), so the traffic rules set the same requirement regardless of how brightly the tunnel is lit. This knowledge directly affects the visibility of the vehicle to others and the timely recognition of obstacles.
The question tests Section 19 "Use of External Lighting Devices," specifically paragraph 19.1 (a), which states directly: in tunnels, mechanical vehicles must have their low beam (or high beam) headlights turned on while driving. That is why the option with low or high beam is correct: the rules allow the use of high beam, but under the general requirement not to dazzle other road users. Additionally, it is important to remember that paragraph 9.8 (Section 9 "Warning Signals") emphasizes the obligation to use low beam headlights in tunnels during daylight hours, but this does not override the wording of 19.1 regarding low (or high) beam headlights as a category.
Alternative options in such tasks are typical traps for the theoretical exam. Position lights do not meet the requirement for a mechanical vehicle in a tunnel, as they only indicate the dimensions and do not replace headlights. Fog lights are mentioned in the note to p. 19.1 only for conditions of insufficient visibility as a possible substitute for low/high beam, but the provision about tunnels is a separate rule, so for entering a tunnel this option is not suitable. The option with only low beam looks plausible, but within the context of this exam question, it is more correct to rely on the norm of 19.1 (a), where low or high beam headlights are allowed.
Clause 19.1 a) (Section 19 "Use of external lighting devices")
"During hours of darkness and in conditions of insufficient visibility, regardless of the degree of road illumination, as well as in tunnels, the following lighting devices must be switched on on a moving vehicle: a) on all motor vehicles — dipped (main) beam headlights; ..."
Clause 19.1 (note to clause 19.1)
"Note. In conditions of insufficient visibility, it is permitted to switch on fog lights instead of dipped (main) beam headlights."
Brief application: the note refers specifically to "conditions of insufficient visibility"; the question concerns driving in a tunnel "regardless of its degree of illumination," so the basic requirement for motor vehicles in a tunnel is determined by clause 19.1 a) — dipped (main) beam headlights.
Clause 9.8 f) (Section 9 "Warning signals")
"While driving motor vehicles during daylight hours, in order to mark a moving vehicle, the dipped beam headlights must be switched on: ... d) in tunnels."
Brief application: this clause further emphasizes the obligation to switch on dipped beam headlights specifically during daylight hours in tunnels, whereas clause 19.1 a) establishes the general requirement for driving in tunnels (with the possibility of using dipped or main beam headlights).
That is, the correct answer is "Dipped or main beam headlights," given that according to the definition of the Traffic Rules, in tunnels, motor vehicles must have dipped (main) beam headlights switched on while driving (clause 19.1 a)).
When entering a tunnel, the driver must act not "based on perceived lighting," but according to the direct requirement of the Rules. A tunnel is a place where visibility and perception of the road situation can change sharply at the entrance and exit, so the Traffic Rules establish the same rule for all tunnels.
Clause 19.1 (a) of the Traffic Rules of Ukraine states that in tunnels, moving mechanical vehicles must have their low or high beam headlights turned on. The key condition here is that this must be done regardless of how well the tunnel is lit. That is, even if there is bright artificial lighting inside, the headlight requirement still applies.
In practice, this means: when approaching the "Tunnel" sign and before entering, the driver should turn on the low beam headlights in advance. High beam is also allowed as an option, but only if it does not dazzle other road users. Fog lights are not the correct answer for this question, because for tunnels, the Traffic Rules specifically name the required device: low (or high) beam headlights.
Therefore, the correct answer is "Low or high beam headlights," since according to clause 19.1 (a) of the Traffic Rules, a mechanical vehicle must drive in a tunnel with the low or high beam headlights on, regardless of lighting.