When are bike crashes most common?

Bike crashes are most common when a driver turns in front of the path of a biker because this scenario often leads to a dangerous situation for both parties involved. Drivers may not adequately check for cyclists when making turns, especially at intersections, which can result in the driver cutting off the biker. This lack of awareness and precaution can lead to significant collisions, as cyclists are often more vulnerable in such situations due to their smaller size and less protection compared to motor vehicles.

In contrast, other options like the biker being at fault or riding at night, while they can contribute to accidents, don't capture the frequent interactions that lead to crashes as poignantly. Similarly, while not wearing a helmet can affect the severity of injuries sustained, it doesn’t directly relate to the frequency of crashes themselves. The nature of the interactions between drivers and cyclists is a critical factor in understanding why this particular scenario is most common for bike crashes.