It seperarates the direction of traffic flow
In the US, both solid white lines and double white lines are used to mark areas of prohibited lane changes in multi-lane traffic. Broken (dashed) yellow lines, solid yellow lines, and double yellow lines are used to separate traffic moving in opposite directions.
The white lines on the side of the road indicate the marker before the road shoulder. The yellow and sometimes white lines in the center mark the divide of the road for opposing directions of traffic.
In the USA: Two way traffic divider, passing (both sides) allowed.
The pattern of yellow lines on the roadway indicates restrictions for passing and changing lanes. Solid yellow lines usually mean no passing, while dashed yellow lines allow passing with caution. It is important to obey these markings to ensure safety on the road.
A solid yellow line next to a broken yellow line means that vehicles next to the broken line may pass. The yellow lines define the road as two way, traffic opposing each other. The side of the road with the solid yellow line facing it is a no-passing zone, while the opposite side of the road, with the intermittent line facing it, passing is permitted.
The yellow lines refer to parking controls on UK roads. When double yellow lines are in force, you can't. (note that double yellow lines are not always operational at all times. The restriction prevents parking on or adjacent to double yellow lines. There is no mention in the regulations about which side of the yellow lines and therefore they are effective for vehicles parked on pavements or verges. Look at the Highway code text next to the pictures of double yellow lines in the Road Markings section.
None. Yellow lines on the road was a British idea. Britain introduced the idea to Canada, then the US adopted the idea from the Canadians. Michigan was the first American state to paint the lines on their roadways.
Hazard close to the edge of the road. The downward lines show the side on which you may safely pass.
Yes, you can provided the yellow lines are :Solid yellow lines mark the center of a road used for two-way traffic.Broken yellow lines mean you may pass if the broken line is next to your driving lane.Two solid yellow lines mean no passing. Never drive to the left of these lines unless you are:Turning left at an intersection.Turning into or out of a private road or driveway.In a carpool lane that has a designated entrance on the left.Instructed by construction or other signs to drive on the other side of the road because your side is closed or blocked.(1) Solid yellow line: No passing if solid yellow line is on your side.(2) Double solid lines: DO NOT pass.(3) Broken yellow line: May pass if movement can be made safely.Two sets of solid double yellow lines spaced two or more feet apart are considered a barrier. Do not drive on or over this barrier or make a left turn or a U-turn across it except at designated openings. (See diagram .)
The yellow solid line in the middle of the road means that you are to stay on your side of the road, no passing!
Yellow lines of all types indicate the leftmost edge of where you can drive in a certain direction. A double solid yellow line may not be crossed except when making a left-hand turn to either leave or join the road divided by said line. A single yellow line on a two-lane, two-way road serves the same purpose. Some jurisdictions use yellow lines on one-way roadways or divided highways to indicate the left edge of the roadway.