What is the rule regarding using turn signals?

Using turn signals is a critical aspect of safe driving, as it communicates your intentions to other road users. Always signaling your intent to turn or change lanes ensures that everyone around you is aware of your actions, which can significantly reduce the risk of accidents. By using turn signals consistently, you provide important information to drivers and pedestrians, helping to establish a predictable flow of traffic. This practice not only demonstrates courtesy to other road users but also adheres to traffic laws that are designed to keep everyone safer on the road.

In contrast, the other options suggest limited or optional use of turn signals, which can lead to confusion and potential hazards. Only signaling when changing lanes, treating signals as optional, or limiting signals to heavy traffic situations undermines the fundamental purpose of turn signals and increases the likelihood of miscommunication on the roadway.