When passing another vehicle, when must drivers use turn signals?

Using turn signals before pulling out to pass another vehicle is essential for ensuring safety and maintaining effective communication with other drivers on the road. This action alerts the driver of the vehicle being overtaken as well as any other nearby vehicles of your intention to change lanes or position on the road. Proper signaling plays a crucial role in preventing accidents by providing clear indications of your actions, allowing others to adjust their speed or positioning accordingly.

In the context of the options provided, signaling only after pulling out or only when close to other vehicles does not contribute to proactive safety measures, as it may not give sufficient warning to nearby drivers. The assertion that it's not required is incorrect because the law mandates the use of turn signals in such situations to promote safer driving practices.