Italy transport regulator says new rules not imposed unilaterally on concessionaires

ROME (Reuters) - Italy's new rules on toll-road tariffs will not be imposed unilaterally on existing concessions, the transport authority said on Tuesday, after toll-road operators warned that the new rules could harm investment.The authority late on Thursday unveiled changes to the way tariffs are calculated, effectively lowering returns that companies can expect to reap on their investments."There is no uncertainty on regulation. There isn't. And there couldn't be any unilateral modification..