This seems relatively new (?), as it don't see it mentioned anywhere but on BKV's own website.
Can anyone confirm that we are not required to identify the number of travelers. It seems to have the same 4 boxes to fill out as the individual travel card.
The card is for a group of 2-5, and I am hoping that if 5 of us use it early in the day, it could also be used later in the day if just 2 or 3 of us want to go out.