Depending on which country you are in.
Generally it means 'Do not cross', keep to your your lane, no passing.
A double solid white line separates two lanes of traffic going in the same direction. Crossing a double solid line is prohibited.
Double solid yellow is between two lanes of traffic with oppsing directions. This indicates no passing a vehicle that is traveling the same direction by moving to the oposing lane momentarily. You have to stay in your lane. Solid white is a line between two lanes going the same direction, but indicates changing lanes is not admissable unless safety concerns exist. Again, you have to stay in your lane.
no passing
A double solid yellow line in the center of the highway is there to separate the two directions of traffic. In most cases, you should not cross that line. On a two-lane road where passing is allowed, one line (or both) will usually become a dashed yellow line. Some locales do not allow turns off the highway across a double yellow line.
two different lanes
you cant park there
The white line on the shoulder of a highway is called the FOG 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.
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.
It means that lanes to both sides of that line travel in the same direction.
divided highway
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.