What action should you take before merging into traffic?

Answer: B — Check traffic gaps using mirrors

Before merging into traffic, it is crucial to check traffic gaps using mirrors. This action allows you to assess the speed and distance of vehicles in the lanes you wish to enter, ensuring you choose a safe moment to merge. By checking your mirrors, you can identify any potential obstacles or hazards, such as vehicles that are too close or moving too fast, which helps you make informed decisions about when and how to merge safely. Proper mirror usage is essential for maintaining awareness of your surroundings and preventing accidents, as it provides a clear view of blind spots and adjacent lanes. This practice is a fundamental part of safe driving and is emphasized in CDL training to prepare drivers for real-world conditions on the road.