Every successive left lane is meant for passing traffic in the lane to the right of it. This is a touch simplistic (the rightmost lane is for traffic entering/e

Every successive left lane is meant for passing traffic in the lane to the right of it. This is a touch simplistic (the rightmost lane is for traffic entering/exiting) but the practical bit is relatively simple: Drive in the furthest lane to the right that is practical. Merge left to pass a person in front of you. Merge back right when you are no longer passing. Do this regardless of which lane you are in.