It really boils down to the whims of whatever agency has jurisdiction over that specific road.
They mean that no vehicle should cross them to pass or turn. Depends where you are but in many places double lines in the middle of the road mean overtaking another car is not allowed.
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.
You can, but why bother, a pipe from each, meeting in the middle is far simpler.
Bar lines, or measure lines.
a quaver
The broken white lines down the middle of the road serves as the separate lines of traffic or to protect any traffic that may be turning right.
The lines in the middle of the courtthat are congruent to the baseline.
Double yellow lines.
Yes it is illegal, you cannot cross double white lines in Colorado.
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.
Lines going in the same direction. Ex. <-------------------->----------------------> <-------------------->----------------------> The marks in the middle show that the lines are for sure parallel.
gaps in the middle of lines.