Re: a solid white line
No. It is a white line which is painted on the road. If the line is solid (ie just one long straight white line), then you are not allowed to cross it in order to overtake the vehicle in front of you. If the line is broken (ie short white lines with spaces between them) then you are allowed to cross.
The writer was caught on a narrow road, behind a very slow truck, and he could not move over to the other side of the road to overtake it because the solid white line was painted on the road, telling him that he must stay on the correct side of the road.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.