If a street has a central lane bordered by solid yellow and broken yellow lines, you

If a street has a central lane bordered by solid yellow and broken yellow lines, you turn left.

Bordered by solid yellow and/or broken yellow lines, is in the center of streets and highways to make left turns.

Traffic Striping (makings created by diagonal yellow lines, on streets and highways) on the other hand indicate that the road is narrowing or there is an obstruction on the roadway.