What is the first action to take if you encounter a vehicle veering into your lane?

The most appropriate first action when encountering a vehicle veering into your lane is to steer away from the vehicle. This maneuver helps create space and distance between your vehicle and the one encroaching into your path, thereby reducing the risk of a collision. By steering away, you can avoid a potential accident and maintain control over your vehicle, allowing for a safer reaction to the unexpected situation.

Honing your horn, while it may alert the other driver, does not physically alter their behavior or improve your immediate safety. Accelerating to pass could place you in a more vulnerable position, possibly leading to further complications, especially if the other driver continues to move erratically. Braking sharply could lead to the rear vehicle not being able to stop in time, increasing the risk of a rear-end collision. Thus, steering away is the most effective and safest response in this scenario.