Question juridique clé
Whether X. violated the duty to signal and position in time before turning left, and whether that violation caused the accident.
Solution extraite
X. signaled and positioned too late; however, the record did not establish with sufficient certainty the distance and reaction possibilities needed to confirm causation.
Motifs extraits
The Federal Court held that the timing of the signal must be assessed case by case. While 20.5 meters and roughly 2.5 seconds were clearly too short in principle, the cantonal court had not sufficiently clarified the distance between the vehicles when X. looked back. Without that finding, causation could not be affirmed with the necessary certainty.