It should be the responsibility of the Member State of establishment to verify that an undertaking satisfies at all times the conditions laid down in this Regulation so that the competent authorities of that Member State are able, if necessary, to decide to suspend or withdraw the authorisations which allow that undertaking to operate on the market. Proper compliance with, and reliable monitoring of, the conditions governing admission to the occupation of road transport operator presuppose that undertakings have an effective and stable establishment.