lanes assigned to psv with timeline limit

I would like to describe a highway that has 6 lanes and 3 most-left are assigned to buses and taxis on weekdays and Sat. (at a specific times) but any other vehicles are allowed at other times.

I tried this keys/values combination

highway=secondary  
lanes=6
psv:lanes=no|no|no|designated|designated|designated
motorcar:lanes:conditional=|||no|no|no @ (Mo-Fr 08:00-22:00, PH off)

the last one (motocar...), JOSM Validator told me its syntax was wrong.

What is the best way to indicate that?