Ahmed was driving to his friend's place to attend a house party. He had never been there before. So, when Ahmed got close to the destination he was looking around to locate his friend's house. Even though he was driving slowly, he could not avoid colliding with another oncoming vehicle. Later it was discovered that Yumi, who was driving the other vehicle, did not switch on her headlights even though it was already dark in the evening.

Required: Referring to the three elements of the tort of negligence advise if Ahmed is liable for negligence. Is there any defence Ahmed can rely on this scenario?