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The best practice is to signal your turn early, as this provides other drivers, cyclists, and pedestrians with adequate notice of your intention to change direction. Signaling early helps establish predictable behavior on the road, allowing others to adjust their actions accordingly, which enhances safety for everyone involved.

Using your turn signal in advance of the turn allows drivers behind you to prepare to slow down or change lanes if necessary. It also informs pedestrians at crosswalks that you will be turning, giving them time to react. Furthermore, it helps in managing expectations during driving, which is crucial for safe navigation in traffic.

This approach contrasts with signaling immediately before the turn, as that can lead to confusion or uncertainty for others on the road. The other choices do not encompass the preventive and communicative benefits of signaling early, leading to a more coordinated and safe traffic environment.