What is the most effective way to deal with a tailgater?

Changing lanes to allow a tailgater to pass is the most effective way to handle the situation. By doing this, you create a safe space between you and the tailgater, which can help to reduce stress on both parties. It allows the driver behind you to move ahead without having to engage in risky maneuvers that could lead to an accident.

Speeding up might seem like an immediate fix, but it can encourage the tailgater to drive more aggressively or engage in risky behavior. Signaling them to back off does not guarantee that they will respond appropriately, and it may provoke frustration. Braking suddenly can create a dangerous situation, increasing the risk of a collision. Thus, changing lanes is the safest and most effective method to mitigate the risk posed by a tailgater while maintaining overall safety on the road.