What must you do before merging onto the highway in a commercial vehicle?

Answer: A — Increase speed to match the flow of traffic

To merge safely onto a highway in a commercial vehicle, increasing speed to match the flow of traffic is essential. This practice helps ensure that you can enter the highway smoothly and safely without disrupting the existing traffic patterns. When you accelerate to the speed of vehicles already on the highway, you reduce the risk of accidents that can occur if your speed is significantly different from that of other drivers. Maintaining the flow of traffic allows for a safer merging process, as other drivers can anticipate your movements and adjust their speed accordingly. It's particularly important for larger vehicles, which take more time and distance to accelerate, making it vital to merge safely and efficiently. In contrast, simply slowing down or turning on hazard lights could lead to confusion among other drivers and increase the chance of a collision. Merging without adjusting your speed might result in either cutting off other drivers or being unable to merge at all. Thus, aligning your speed with the traffic is the best practice for a safe merger onto the highway.