Before prolonging such controls, the Member States concerned should exchange views with the relevant Member State(s) with a view to ensuring that internal border controls are carried out only where it is considered necessary and proportionate. Furthermore, the Member States concerned should ensure that internal border controls are only carried out as a last resort measure when other alternative measures cannot achieve the same effect, and only at those parts of the internal border where it is considered necessary and proportionate, in accordance with the Schengen Borders Code. The Member States concerned should notify the other Member States, the European Parliament and the Commission accordingly.