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For answer  A  and  B 

It is not enough to use only the hazard warning lights or only to install the reflective triangles when the motor vehicle breaks down on the carriageway. The road traffic legislation clearly imposes the obligation to use both types of signalling: both the hazard warning lights and the reflective triangles must be used simultaneously in such situations.

For answer  C 

In the situation in which you remain with the vehicle broken down on the carriageway, you must take it immediately outside the carriageway. And if taking it outside the carriageway is not possible, you must move it next to the curb or shoulder, signalling the vehicle by putting into operation the hazard warning lights and by installing the reflective triangles at at least 30 meters before and after it.

The correct answer is: C

Recommendations:

Obligations and prohibitions in case of technical breakdown - Audio-Video Lesson --> Road Traffic Code - Obligations and prohibitions in case of technical breakdown or when towing vehicles

Correct use of the lighting and signalling system - Audio-Video Lesson --> Road Traffic Code - The technical condition of vehicles and the lighting and luminous signalling system

Obligations and prohibitions of vehicle drivers during driving - Audio-Video Lesson --> Road Traffic Code - Obligations, prohibitions and aggressive driving

Regulation** - Article 155

(1) In the case of a motor vehicle, agricultural or forestry tractor or its trailer breaking down, the driver of the combination is obliged to take it immediately outside the carriageway or, if this is not possible, to move it next to the curb or shoulder, placing it parallel to the axis of the road and taking measures to remedy the deficiencies or, as the case may be, for towing.
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Regulation** - Article 156

(1) If a motor vehicle, agricultural or forestry tractor or a trailer has broken down on the carriageway of the road and cannot be moved outside it, the driver of the motor vehicle, agricultural or forestry tractor is obliged to put into operation the hazard warning lights and to install the reflective triangles.
(2) The reflective triangles are installed in front and behind the vehicle, on the same traffic lane, at a distance of at least 30 m from it, so that they can be observed in time by the traffic participants who are approaching. In urban areas, when the traffic is heavy, the reflective triangles may be placed at a shorter distance or even on the vehicle, so that they can be observed in time by the other drivers of vehicles.
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** Regulation = REGULATION for the implementation of OUG 195/2002 updated (The Road Traffic Code Regulation)