How should you react if another driver merges into your lane without signaling?

Answer: C — Maintain your speed and allow space

When another driver merges into your lane without signaling, maintaining your speed and allowing space is the safest and most appropriate reaction. This approach focuses on ensuring your own safety as well as the safety of the other driver. By keeping a safe distance, you reduce the risk of a collision and give the merging driver time to adjust their position responsibly. Aggressive maneuvers or confrontational behaviors, such as yelling or speeding up to get ahead, can escalate the situation and increase the potential for accidents. The calm and measured reaction not only reflects good defensive driving practices but also encourages a safer driving environment for everyone on the road.