Where, in implementing the measures provided for by this Directive, a Member State determines that a measure is not adapted to the epidemiological situation, or where the foot-and-mouth disease virus appears to be spreading despite the measures taken in accordance with this Directive, a Decision may be adopted on an ad hoc basis in accordance with the procedure referred to in Article 89(3) to authorise that Member State to implement alternative measures with equivalent epidemiological effect for a limited period of time appropriate to the epidemiological situation.