What should you do if someone is trying to merge onto the interstate?

When someone is trying to merge onto the interstate, changing lanes to the left when it is safe to do so is the most appropriate action. This maneuver helps to create a gap for the merging vehicle, facilitating a smoother transition onto the highway. It's important to yield to merging traffic, as this supports safe driving conditions and promotes a cooperative driving environment.

This approach also takes into account the dynamics of traffic flow on the interstate, where vehicles are generally traveling at higher speeds. By moving to the left lane, you allow the merging vehicle to enter the right lane without forcing them to adjust their speed significantly, which can help prevent potential collisions or accidents.

In contrast, speeding up to block the merging vehicle or staying in your lane may create dangerous situations, as it can pressure the merging driver and lead to sudden stops or collisions. Using headlights to signal, while a good practice in some contexts, does not effectively communicate your intention to create space for the merging vehicle, making changing lanes to the left a clearer and safer option in this scenario.