Which action is required when preparing to change lanes?

Using turn signals is essential when preparing to change lanes because it communicates your intentions to other road users. This action is crucial for safety, as it alerts drivers behind and adjacent to you that you plan to change your position on the road. By signaling, you allow others to predict your movements, reducing the chance of collisions or misunderstandings.

While accelerating to enter the lane may be necessary in certain situations, it is important to first ensure that the lane is clear and that other drivers are aware of your intended move. Checking only the side mirror does not provide a complete view of the traffic situation; blind spots must also be checked with a head turn to ensure it is safe to proceed. Looking straight ahead is important for general awareness on the road, but it does not take into account the changes you plan to make in your vehicle's position or the vehicles surrounding you. Therefore, signaling properly is the fundamental and required action when preparing to change lanes.