ROME, April 18 (Reuters) - Atlantia investor and hedge fund TCI has urged Italy's government not to put any pressure on the Italian infrastructure group to strike a deal to sell its motorway business Autostrade, a letter seen by Reuters shows. TCI's letter, dated April 12, asks the government to allow Atlantia to evaluate "independently and free from any political interference" an offer for Autostrade from Spanish infrastructure group ACS. Autostrade, which manages half of Italy's motorway network, has been in the political crosshairs since the 2018 deadly collapse of a Genoa motorway bridge run by the company.