In the US, yellow lines indicate a division between lanes flowing in the opposite direction. White lines are used otherwise. So there's a yellow line on the lef

In the US, yellow lines indicate a division between lanes flowing in the opposite direction. White lines are used otherwise. So there's a yellow line on the left because it abuts the barrier dividing the lane from oncoming traffic. The dashed line in the middle is white because it separates two lanes flowing the same direction. And the solid line on the right is white because it does not abut any opposite-flow lanes but rather represents the edge of the road.