http://www.flhsmv.gov/html/online.html
A solid white line marks the right edge of the roadway or separates lanes of traffic moving in the same direction. You may travel in the same direction on both sides of this line, but you should not cross the line unless you must do so to avoid a hazard.
Double Solid White Line
A double sold white line separates two lanes of traffic going in the same direction. Crossing a double solid line is prohibited.
Not sure if this helps answer your questions about solid white lines. I posted link to Driver Handbook.
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