What must you do when passing a car on a two-lane road?

When passing a car on a two-lane road, it's essential to signal your intent to change lanes. This allows other drivers, including the vehicle you are attempting to pass, to anticipate your movements and adjust their driving accordingly. Sounding your horn can serve as an additional alert, signaling to the driver being passed that you are there and intend to overtake them, although this should be done judiciously. Maintaining a safe distance ensures you can maneuver safely between vehicles without risking a collision.

This combination of signaling, using your horn when necessary, and keeping a safe distance is crucial for ensuring both your safety and the safety of others on the road while passing. It promotes safer driving practices and helps prevent accidents that could arise from sudden lane changes or miscommunication between drivers.