Top, a quick peruse ‘but’… centreline. I’ve been utilizing divider=* extensively to tag bi-directional ways with solid, double, dashed linings. In practice there’s a whole slew of those like a double centreline, 1 solid, 1 dashed to indicate who’s allowed to overtake. Even read about colour coded centre lines… I refrain from commenting on that idea (which is an inferred comment I suppose ;p).
/OT