The bus 45 stops are accessible. Nevertheless, it may be better to use the Uilenstede or Onderuit stops.
A shuttle bus is in service for pedestrians running from the western Biesbosch bus stop to the easter Biesbosch stop. The run takes about two minutes. The shuttle bus is in service between 05:30 and 01:10 and in the nights of Friday into Saturday and Saturday into Sunday.
You can find more info for cyclists and vehicular traffic at amstelveenlijn.nl.