Final answer:
To safely pass a vehicle on the left, ride in the left portion of the lane, maintain a safe distance, and signal your intentions before passing. Do not get too close or pass without signaling.
Step-by-step explanation:
When preparing to pass another vehicle on the left, the correct action is to ride in the left portion of the lane. This provides a better view ahead and makes it easier for the driver of the vehicle being passed to see you in their mirrors. It is essential to avoid getting too close to the vehicle in front of you to maintain a safe following distance. Before making a move to pass, always signal your intentions to inform other drivers of your maneuvers, enhancing safety for everyone on the road.
In the case of an emergency vehicle like an ambulance, it's important to stop and become stationary to allow it to pass safely. If you're standing on a sidewalk and see a bicyclist passing by, from their reference frame, you would be moving to their left.