Yellow Line Marking

yellow lines separate traffic lanes flowing in different directions, and a single dashed line means that you can legally make a passing maneuver in that area. If it's solid on one side and dashed on the other, it means you can legally pass if you're driving on the side with the dashes but you cannot pass if you are on the side with the solid line.

There are two special cases of yellow dashed lines. If you see an extra lane in the middle that has dashed lines on both sides on the inside and a solid line on both sides on the outside, this is a middle turning lane. Cars merge into this lane (driving in either direction) to complete a left turn without interrupting the traffic behind them.

There are two special cases of yellow dashed lines. If you see an extra lane in the middle that has dashed lines on both sides on the inside and a solid line on both sides on the outside, this is a middle turning lane. Cars merge into this lane (driving in either direction) to complete a left turn without interrupting the traffic behind them.

If you see two columns of dashed lines, then you've stumbled across a reversible center lane. These are not very common. The direction of the center lane will generally be indicated by an overhead sign (either a red X indicating you are driving the wrong way or a green arrow indicating you are driving the right way). The direction of the center lane typically reverses to promote rush hour traffic during morning and afternoon commutes.