When applying the return border procedure, certain provisions of should apply, as they regulate elements of the return border procedure that are not set out in this Regulation, in particular those on definitions, more favourable provisions, non-refoulement, the best interests of the child, family life and state of health, the risk of absconding, the obligation to cooperate, the period for voluntary departure, the return decision, removal, the postponement of removal, the return and removal of unaccompanied minors, entry bans, safeguards pending return, detention, the conditions of detention, the detention of minors and families, and emergency situations. To reduce the risk of unauthorised entry and movement of illegally staying third-country nationals and stateless persons subject to the return border procedure, a period for voluntary departure should be granted. That period for voluntary departure should be granted only upon request and it should neither exceed 15 days nor confer a right to enter the territory of the Member State concerned. Persons concerned should surrender any valid travel document in their possession to the competent authorities for as long as necessary to prevent their absconding. The provisions on return set out in this Regulation are without prejudice to the discretionary possibility for Member States at any time to decide to grant an autonomous residence permit or other authorisation granting a right to stay for compassionate, humanitarian or other reasons to a third-country national staying illegally on their territory.