Obligations on overtaking before initiating the maneuver

Article 84. Obligations on overtaking before initiating the maneuver.
1. Before starting an overtake that requires lateral displacement, the driver intending to overtake must so indicate with sufficient notice using the mandatory signals and to verify that free space exists in the lane intended for overtaking sufficient for the maneuver and that he does not endanger or obstruct oncoming traffic, considering their own speed and that of other users. If not, he must not overtake (LST Art 33,1).
No driver may overtake multiple vehicles if he does not have total safety, being able to return to the right hand lane if oncoming traffic should appear, without endangering any of the overtaken vehicles.
On roads with two-way traffic and three lanes separated by discontinuous longitudinal marks, overtaking may only be carried out when the central lane is unoccupied by oncoming traffic.
2. Also he must make sure that the driver of the vehicle in front in the same lane has not indicated his intention to move out; in such a case, he must respect the other driver’s priority. However, if after a sensible time the driver of the said vehicle does not exert his priority, the overtaking maneuver may be started if so indicated using the appropriate acoustic or optical signal (LST Art 33,2).
It is totally prohibited to overtake vehicles that are already overtaking another one if the driver of the third vehicle, to carry out this maneuver, has to invade the part of the road reserved for oncoming traffic.
3. Also, he must make sure that no driver who is following in the same lane has started to overtake his vehicle, and that he has sufficient space to return to his lane when after overtaking (LST Art 33,3).
4. The mandatory signals that the driver must use before starting to move out are described in Article 109.
5. The Article does not consider as overtaking that between cyclists who travel in a group (LST Art 33,4).
6. Infractions of this Article are considered serious offences (LST Art 65.4.c).