The transitional period should come to an end after a maximum of five years, but it may be prolonged for a further two years in those member states where there are serious disturbances of the labour market or a threat of such disruption. This case would have to be demonstrated. Finally, national measures in the transitional period may not be more restrictive than the provisions in force at the date of signing of the accession treaty. Austria and Germany have the right to apply national measures to address serious disturbances, or the threat thereof, in specific sensitive sectors in their labour markets, which could arise in certain regions from cross-border provision of services.