What is the correct way to use turn signals when changing lanes?

The correct approach to using turn signals when changing lanes is to signal your intent at least 100 feet before making the lane change. This practice allows surrounding drivers to be aware of your intentions well in advance, promoting safety on the road by providing ample time for others to react. Proper signaling is critical in ensuring that all road users can anticipate your movements, which is especially important in high-traffic situations where sudden moves can lead to accidents.

In contrast, signaling only when there is no traffic could create an unsafe situation, as it might not alert other drivers who are present and could misinterpret your actions. Signaling after changing lanes fails to communicate your intentions effectively, leaving other drivers unaware of your movement until it's too late. Finally, signaling continuously during the lane change may confuse other drivers about your true intentions, as they might not be able to discern whether you are actively changing lanes or simply indicating a direction. Therefore, initiating the signal in advance provides clarity and enhances overall road safety.