What action must a driver take when using a lane reserved for bicycles?

When a driver is using a lane reserved for bicycles, the most appropriate action to take is to enter that lane only when turning. This is critical for ensuring the safety of both the cyclist and the driver. Bicycle lanes are designated spaces to allow cyclists a safe area to travel, separate from vehicles. By only entering that lane while making a turn, the driver minimizes potential conflicts with cyclists who are using the lane for its intended purpose.

Driving slowly or stopping completely are not viable actions for using a bicycle lane, as those responses do not effectively address the specific rules regarding how drivers should interact with bicycle lanes. Additionally, while yielding to pedestrians is always a good practice, it does not directly relate to the regulation of entering and using bicycle lanes, which is primarily focused on the interaction between vehicles and cyclists. Thus, the clear guideline is to reserve access to the bicycle lane for turning maneuvers only.