8.1.15. At which traffic light is the signal illuminated that allows the tram to turn right?
UAНа якому світлофорі горить сигнал, що дозволяє трамваю повернути праворуч?
This is an exam question from the Traffic Rules of Ukraine concerning the safe passage through intersections and the correct interpretation of traffic signals for rail vehicles. In real traffic, a mistake in 'reading' a tram traffic light can lead to a conflict of trajectories at the intersection, since the tram moves according to separate traffic rules and has limited maneuvering capabilities.
The question tests knowledge of the section of the Traffic Rules about traffic signals, specifically paragraph 8.7.5, which describes T-shaped tram traffic lights with white-moon signals. The key logic is as follows: tram movement is allowed only when the lower (entry) signal and one or more upper signals are simultaneously on; the direction is determined by the upper signals, where the upper right signal means a right turn is possible. Therefore, the correct answer is the option with the second traffic light, because only there is the required combination: the lower signal is on and among the upper ones the right one is lit.
If you analyze the answer options, the combinations 'third and fourth,' 'only the fourth,' 'second and fourth,' and 'first and second' are excluded due to the lack of the mandatory condition from p. 8.7.5: without the lower white-moon signal, movement is prohibited, even if the upper right signal indicates a right turn. This is a typical trap for the theoretical exam: the student sees the upper right signal but does not check for the lower one, which actually gives permission to enter.
Clause 8.7.5
To regulate tram traffic, traffic lights with four white lunar-colored signals arranged in the shape of the letter "T" may be used. Movement is permitted only when the lower signal and one or more of the upper signals are simultaneously lit, where the left one allows movement to the left, the middle one — straight ahead, and the right one — to the right. If only the three upper signals are on, movement is prohibited. In case of the tram traffic lights being turned off or malfunctioning, tram drivers must follow the requirements of traffic lights with red, yellow, and green light signals.
This clause tests the ability to correctly "read" the T-shaped tram traffic light: turning right is allowed only when both the lower white lunar signal (as a mandatory condition for movement) and the right upper white lunar signal (as the "right" direction) are simultaneously on.
Therefore, the correct answer is "At the second traffic light," given that according to the definition in the Traffic Rules, tram movement (including to the right) is permitted only when both the lower white lunar signal and the corresponding upper directional signal are on, and this is exactly what is shown at traffic light No. 2.
This question is not about the regular traffic signal with red, yellow, and green lights, but about a special tram traffic signal with white-moon signals arranged in the shape of the letter 'T'. The meanings of these signals are described in clause 8.7.5 of the Traffic Rules of Ukraine.
According to this clause, tram movement is allowed only when the lower white-moon signal and one or more of the upper signals are lit simultaneously. The lower signal is mandatory: without it, the tram is prohibited from entering, even if the required direction signal among the upper ones is lit.
The direction of movement is determined by the upper signals: the upper left allows a left turn, the upper middle allows straight movement, and the upper right allows a right turn. That is, to turn right, the following combination is required: the lower signal is on and the upper right is on.
On the first traffic signal, although the upper right signal is on, the lower signal is off, so the tram is prohibited from moving. On the second traffic signal, the lower signal is on and among the upper ones the right is lit, so the tram is allowed to turn right (this combination also allows any other direction indicated by the lit upper signals).
Therefore, the correct answer is "At the second traffic signal," since only there are both the lower white-moon signal and the upper right signal lit at the same time, which according to clause 8.7.5 of the Traffic Rules allows the tram to turn right.