What is the essential first step in changing lanes safely?

Using your turn signal is the essential first step in changing lanes safely because it communicates your intention to other drivers. Signaling alerts those around you that you plan to move into a different lane, which allows them to adjust their speed or position accordingly. This is critical for maintaining safety on the road, as other drivers need to be aware of your movements to avoid collisions.

When you signal, it is also important to follow it up with a visual check of your surroundings before making the lane change. This involves checking mirrors and your blind spot to ensure that it is safe to proceed. While other choices involve actions that may or may not contribute to lane changing safety, such as accelerating quickly or looking straight ahead, they do not provide the communication aspect that signaling does, which is essential in preventing accidents.