Why does a truck that is traveling in the opposite direction to you on the Street appear to be moving faster than it would if you were not moving

The reason a car traveling in the opposite direction of the way you're traveling is simple. if you are going one way, and cars are passing you on the other, it appears that they are going much faster than they are. the combination of your relative speeds means that those cars might appear to be doing 60mph, rather than 30mph.