Nathan asked: Is this movement legal, if one follows all pedestrian laws while crossing the road?
Would the answer change if there were no median break at all (and thus one would ride across the grass where a pedestrian might walk)?
Bicyclists have the rights and duties of a pedestrian only when on the sidewalk or crosswalk. A median is not a sidewalk or crosswalk.
The lane is marked for traffic in a specific direction. Driving a vehicle (bicycle) in the opposite direction in that lane is unlawful.
s. 316.089 – Driving on Roadways Laned for Traffic
Whenever any roadway has been divided into two or more clearly marked lanes for traffic….
(3) Official traffic control devices may be erected directing specified traffic to use a designated lane or designating those lanes to be used by traffic moving in a particular direction regardless of the center of the roadway; and drivers of vehicles shall obey the directions of such device.
Driving a vehicle (bicycle) on the median is prohibited.
s. 316.090 – Driving on Divided Highways
(2) No vehicle shall be driven over, across, or within any such dividing space, barrier, or section, except through an opening in such physical barrier or dividing section or space or at a crossover or intersection as established, unless specifically authorized by public authority.