Before moving out from the kerb into traffic, which action must you take in addition to checking for safety?

Before moving out from the kerb into traffic, signaling for at least 3 seconds is essential because it communicates your intention to other road users. This action enhances safety by allowing drivers, cyclists, and pedestrians to anticipate your movements and adjust accordingly.

Signaling serves as a crucial warning, particularly in busy traffic situations where other vehicles may be close by. The duration of at least 3 seconds ensures that the signal is noticeable and provides ample time for other road users to react. This practice is a fundamental part of safe driving, as it contributes to the clarity and predictability of your actions on the road.

In contrast, the other options do not align with proper procedures for safely merging into traffic. Options involving rapid acceleration or altering the vehicle's direction without signaling do not account for the need to inform others of your intentions, increasing the risk of accidents. Similarly, changing gears is not a necessary action specifically related to the process of merging into traffic. Therefore, the emphasis on signaling as the correct action underscores its importance in promoting road safety and effective communication among drivers.