One of the major causes of vehicle and bicycle accidents is what?

The statement that one of the major causes of vehicle and bicycle accidents is that the motorist does not see the bicycle underscores the importance of visibility in road safety. Many accidents occur because drivers fail to notice cyclists sharing the road, especially in situations where visibility is compromised, such as poor lighting conditions, intersections, or when cyclists are riding in blind spots. This highlights the critical need for both cyclists and motorists to remain vigilant and aware of each other's presence.

While the other factors mentioned, such as the cyclist riding without lights, road conditions, and bicycle maintenance, can contribute to the likelihood of an accident, they do not directly address the issue of awareness and visibility between motorists and cyclists, which is fundamental in preventing collisions.