When is it necessary to signal while driving?

Signaling while driving is crucial for safe communication between drivers and other road users. When changing lanes or turning, using your signal alerts other drivers of your intentions, allowing them to react accordingly. This helps prevent accidents, as other drivers on the road can prepare for your maneuver, whether it involves changing lanes or making a turn.

The other options emphasize situations that may not directly require signaling. Stopping at a red light does not necessitate signaling because your intention is clear; you are ceasing movement altogether. Driving under the speed limit showcases safe driving behavior, but it does not automatically warrant signaling unless a change in position on the road is involved. Lastly, while signaling can be useful when parking, it is not limited to that scenario and should be part of a driver's routine whenever they make maneuvers involving a change in direction or lane.