What must a driver do before merging onto a highway?

Before merging onto a highway, it is essential for a driver to check for a gap in traffic. This step is crucial for ensuring safety and smooth traffic flow. By observing the vehicles already on the highway, a driver can identify an appropriate space in which to merge, helping to avoid collisions and maintain consistency with the speed of the ongoing traffic.

In addition, checking for a gap allows the driver to assess the speed of vehicles approaching from behind, enabling them to choose the right moment to enter the highway. This practice is part of defensive driving and promotes awareness of surrounding vehicles, which is vital in merging situations.

Merging without checking traffic can lead to dangerous situations, as the driver may inadvertently cut off an approaching vehicle or place themselves in a position where they cannot safely enter the roadway. Therefore, ensuring that there is a clear gap in traffic is the proper and responsible action to take before merging.