White lines mark the edges of roadways. They keep or are intended to keep people in "a lane" and off of the shoulder or from running off the road.
It meanings it ok to pass
In the United States, yellow lines divide lanes of oncoming traffic. A solid yellow line indicates you cannot safely or legally pass a vehicle in front of you by merging into the oncoming traffic lane; a broken yellow line indicates you can legally and safely pass a vehicle in front of you by merging into the oncoming traffice land after determining there is no oncoming traffic.
It seperarates the direction of traffic flow
White lines are used to separate lanes of traffic going in the same direction.Solid White LineA solid white line indicates that moving between lanes is forbidden. You cannot cross a solid white line.Broken White LineThe broken white line indicates that moving between lanes is permitted. You may move between lanes as desired.For example a solid white line may be used to separate a dedicated bus lane from regular traffic. Where normal lanes are separated by the dashed line.
4 or 5 way stops, with long lines of waiting traffic, can be replaced with roundabouts giving increased traffic flow .
To regulate the flow of traffic.
Traffic moving the opposite direction of most other traffic
To control the flow of traffic during construction, it's best to have signs posted for drivers to know what is coming up the road. Next, have cones to guide the traffic and an flag person ready to signal which flow of traffic can move.
Pierre Dersin has written: 'Propagation of disturbances in traffic flow' -- subject(s): Traffic flow
Ginger does not affect the menstrual flow.
A broken line consists of dashes, and it indicates that passing is permitted in that stretch of road. A solid line remains unbroken, and indicates that passing is not permitted. Double lines serve a number of purposes. They may be present because permissions are different for opposing lanes, or they may be present to separate traffic. For example, there may be a stretch of road where a southbound lane is permitted to pass, but a northbound lane is not. Thus, there would be a double line, broken on the southbound side, and solid on the northbound side. As for the colours, white lines indicate that traffic on both sides of that line flow in the same direction, whereas lanes on opposite sides of a yellow line flow in opposing directions.
WRONG WAY signs posted at one endabsent yellow linesvehicles all pointing in one directionAdded: Rectangular sign containing a white arrow on a black background pointing in the direction of the traffic flow, with the words ONE WAY in black type centered within the white arrow.Also: A white arrow painted on the street surface pointing in the direction of the traffic flow.