(For the two way direction of traffic) As long as the lane is clear of other cars and you yield to any existing traffic, and you make a left turn into that center lane, while waiting to merge into the main flow of traffic to your right, you would be fine from what I understand (barring any signs or traffic control devices prohibiting it).

What you can't do is make a right turn off a side street, across lanes of traffic of the main road, directly into a center or leftmost lane, which a lot of people do. When making a right turn, the vehicle must turn into the rightmost lane, then change lanes properly to the left.