Clause 33.3 — 33 "Road signs", 3 "Prohibitory signs", sign 3.23 "Left turn prohibited"

"Sign 3.23 'Left turn prohibited' prohibits left turns for vehicles. However, U-turns are allowed. The sign does not apply to vehicles operating on established routes. The sign applies to intersections of carriageways and other places before which the sign is installed."

Brief application: sign 3.23 prohibits a left turn only at the place (at the intersection of carriageways) before which it is installed. Therefore, trajectory A (left turn at the first intersection) is prohibited, while trajectory B (left turn at the next intersection, before which there is no sign) is allowed; going straight (trajectory C) is not prohibited by this sign.

Clause 1.10 (term "Intersection")

Intersection — a place where roads cross, join, or branch at the same level, the boundary of which is the imaginary lines between the beginning of the curves of the edges of the carriageways of each road. Places where roads exit from adjacent territories are not considered intersections.

Brief application: there may be several intersections of carriageways at one intersection; the effect of sign 3.23, installed "before the intersection of carriageways", covers exactly the intersection before which it is installed.

Clause 1.10 (term "Carriageway")

Carriageway — an element of the road intended for the movement of non-rail vehicles.

Brief application: in this task, it is important to understand that sign 3.23 applies to the "intersection of carriageways", that is, to the specific place where the carriageways intersect.

Thus, the correct answer is "Along trajectories B and C.", given that according to the definition of the Traffic Rules, sign 3.23 prohibits a left turn only at the intersection of carriageways before which it is installed (trajectory A), but does not prohibit going straight (trajectory C) and does not apply to the next intersection where the turn along trajectory B is made.

In this situation, it is important to correctly determine to which section of the road the effect of sign 3.23 “Left turn prohibited” applies. The diagram shows one intersection, but within its limits there are two separate crossings of carriageways.

Sign 3.23 specifically prohibits a left turn at the place before which it is installed. That is, it does not apply to “the entire intersection as a whole,” but to the specific crossing of carriageways that the driver approaches after this sign.

Trajectory A involves a left turn at the first crossing of carriageways, which is located immediately after the sign. Since sign 3.23 is installed before this crossing, a left turn along trajectory A is prohibited.

Trajectory B means that the driver passes the first crossing and makes a left turn at the second crossing of carriageways. The effect of sign 3.23 does not extend to it, because the sign is not installed directly before the second crossing. Therefore, movement along trajectory B is permitted.

Trajectory C is movement straight ahead. Sign 3.23 does not prohibit going straight, so this direction is also allowed.

Therefore, the correct answer is “Along trajectories B and C,” since sign 3.23 prohibits a left turn only at the first crossing of carriageways (trajectory A), but does not restrict going straight or turning left at the next crossing (trajectories C and B).