Related Rule
Netherlands
Practice Relating to Rule 56. Freedom of Movement of Humanitarian Relief Personnel
The Military Manual (2005) of the Netherlands states:
The parties to a conflict must allow and facilitate the passage of all relief consignments, equipment and personnel. The party which allows passage may prescribe conditions for execution of the relief actions, such as control by it or by a protecting power. Relief actions may also be carried out both by States and by non-governmental organizations. 
Netherlands, Humanitair Oorlogsrecht: Handleiding, Voorschift No. 27-412, Koninklijke Landmacht, Militair Juridische Dienst, 2005, § 0819.