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Question:

On a highway with three or more lanes in each direction, the _________ usually offer(s) the smoothest flow of traffic.

A middle lanes
Explaination

Smooth driving allows you to keep more distance between you and other drivers. It also helps save gas. During ordinary driving, drive in the lane with the smoothest flow of traffic. If there are three or more lanes going in one direction, the middle lanes usually offer the smoothest flow of traffic.