It means that their are different lanes, that you can drive in.
It separates two lanes traveling in the same direction
It means that lanes to both sides of that line travel in the same direction.
It means that you may change lanes freely (i.e.: pass another vehicle) from one to the other.
yes (i think)Added: In the US - intermittently broken (i.e.: dashed) lines down the center of the roadway means that it is permissable to pass. An un-broken DOUBLE line means no passing.
In the United States, it means "you may pass."
The white line on the shoulder of a highway is called the FOG line
A continuous white stripe parallel and to the right of your lane means that you are at the far right of lawful driving on the highway. This line is also called a 'fog line', as it helps the driver see where the edge of the highway is when it is foggy.
A broken white center line on the roadway means that passing is permitted when it is safe to do so. Drivers should yield to oncoming traffic and use caution when crossing the line to pass.
Depending on which country you are in. Generally it means 'Do not cross', keep to your your lane, no passing.
When there are broken double white lines in the road, it means you can cross the lines to pass as long as it is safe. You must be able to safely be back in your lane before you reach a solid white line.
Possibilities are: Single or Double white line, Single or Double yellow line, Solid white line next to broken white line, Solid yellow line next to broken white line, No line on rural country lane roads.
no passing