Final answer:
In a freeway with three or more lanes in one direction, the middle lanes are usually designated for through traffic.
Step-by-step explanation:
In a freeway with three or more lanes in one direction, the lanes that are typically designated for through traffic are the middle lanes.
These middle lanes allow for smoother flow of traffic and are less likely to have vehicles entering or exiting. They provide a clear path for vehicles that are not planning to exit the freeway or change lanes.