Final answer:
The best practice when riding behind a car is to position yourself where you can be seen in the car's rearview mirror. If approached by an ambulance, you should stop and become stationary. Awareness of being observed can alter behavior, impacting the naturalness of actions.
Step-by-step explanation:
When riding behind a car, the safest practice is to ride in a position that will allow the other driver to see you in their rearview mirror. It's important not to assume the driver sees you, as drivers may not always check their mirrors thoroughly. Regarding the correct lane position, it varies by situation and local laws, but typically it's crucial to maintain visibility and predictability, which often means staying near the center of the lane. However, decisions about lane positioning should always take into account the context of the traffic around you, the type of vehicle you're operating (a bicycle or a motorcycle, for example), and road conditions.
In the case of an ambulance approaching, the best course of action is to stop moving and become stationary until it passes. This helps to ensure your safety and avoids adding confusion to an already emergent situation.
When considering observations and frames of reference, it is important to remember that an individual's perception can alter behavior. Being observed, like being followed by a police car, can influence how one acts. This illustrates the importance of being inconspicuous when studying natural behavior, as awareness of observation can lead to altered, unnatural behavior.