What is a legal reason for a cyclist to move left in their lane?

Answer: C — To turn left or pass vehicles

Cyclists are allowed to move left in their lane for a variety of legitimate safety and navigation reasons. One significant reason is to prepare for turning left or to pass vehicles that may be blocking their path. This movement is not simply about changing speed but is often crucial for maintaining safety on the road. When a cyclist intends to make a left turn, it's necessary for them to position themselves further to the left to align with the intended direction of the turn. Additionally, if a cyclist encounters a situation where they need to pass slower-moving vehicles, they will also need to move left to safely navigate around them. This action helps in preventing accidents and ensures that the cyclist can maneuver safely while adhering to traffic rules. These circumstances highlight the importance of proactive positioning in cycling to enhance visibility and reduce conflicts with other road users.