When should you signal to indicate a turn?

Signaling before a turn is a crucial part of safe driving, as it alerts other road users of your intentions, allowing them to react accordingly. Indicating at least 100 feet before making a turn gives other drivers, cyclists, and pedestrians sufficient time to anticipate your maneuver and adjust their own actions if necessary. This practice not only enhances safety but also smooths out the flow of traffic.

The other options suggest signaling in scenarios that either lack sufficient forewarning or are too situational. Signaling only when other vehicles are present does not take into account situations where pedestrians or cyclists might be at risk, while signaling only upon seeing pedestrians disregards the importance of informing all road users, including other vehicles. Finally, signaling as you are turning is ineffective because it does not give anyone enough time to respond to your change of direction. Therefore, the requirement to signal at least 100 feet prior to the turn is the most effective and safest practice.