Those measures should therefore provide for an adequate period during which those certificates can continue to be used on the Union inland waterways for which they were valid before the end of the transposition period.
Ba cheart do na bearta sin, dá bhrí sin, foráil do thréimhse leordhóthanach ama ina bhféadfaí na teastais sin a úsáid ar uiscebhealaí intíre an Aontais a raibh siad bailí dó roimh dheireadh na tréimhse trasuímh.