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The left turn in the case of vehicles that enter an intersection moving on the same road, in alignment (in a straight line) and from opposite directions, is performed through the left of the center of the intersection, without their trajectories intersecting. This maneuver allows each vehicle to turn safely, avoiding any conflict point in the middle of the intersection and ensuring a smooth traffic flow.

And in the situations in which there are special lanes for the left turn, as in the image of this question, the change of direction is done through the left of the imaginary center of the intersection, without the trajectories of the vehicles intersecting, and if there is a guiding marking that indicates the trajectory to follow, it must be respected. The practice of going around the imaginary center of the intersection through the right, so that the vehicles turn one behind the other and intersect their trajectories, is incorrect and can create additional risks of collision and confusion among the traffic participants.

The correct answer is: C

Recommendations:

Traffic in intersections - Audio-Video Lesson --> Road Traffic Code - Traffic in intersections

The meaning of all road markings - Audio-Video Lesson --> Road Traffic Code - Road markings

Direction and traffic lane - Audio-Video Lesson --> Road Traffic Code - Direction and traffic lane

Regulation** - Article 80

[...]
(2) The guiding markings have the role of materializing the trajectory that the vehicles must follow when crossing an intersection or when performing the left turn, being mandatory to be made in the case in which the central axis or the lane separation lines are not collinear.
[...]

Regulation** - Article 110

(1) In the situations in which there are special lanes for performing the maneuver, the change of direction of movement is done through the left of the imaginary center of the intersection, and if there is a guiding marking, with respecting its meaning.
(2) The change of direction of movement to the left, in the case of vehicles that enter an intersection moving on the same road in alignment, but from opposite directions, is performed through the left of the center of the intersection, without intersecting their trajectory.
[...]

** Regulation = REGULATION for the implementation of OUG 195/2002 updated (The Road Traffic Code Regulation)