At what distance should you activate your turn signal when changing lanes on a highway?

Activating your turn signal at least 500 feet before changing lanes on a highway is essential for ensuring safety and effective communication with other road users. This distance provides ample time for drivers behind you and in adjacent lanes to notice your intention to change lanes. It allows them to react appropriately, either by slowing down, adjusting their speed, or changing their own lane if necessary to accommodate your move.

Using your turn signal well in advance helps prevent potential collisions and enhances the flow of traffic by informing other drivers of your intentions. This practice is crucial on highways, where vehicles are often traveling at higher speeds. It provides a buffer for reaction time, reducing the risk of sudden maneuvers that could lead to accidents.

The other distances provided in the options may not allow sufficient time for other drivers to be aware of your intentions, especially at speed, which could contribute to unsafe lane changes and increase the likelihood of accidents. Being proactive in signaling ensures not just your safety, but the safety of all roadway users.