MILAN, Nov 22 (Reuters) - The bondholders of Atlantia's motorway unit Autostrade per l'Italia approved on Monday proposed changes to the terms and conditions of nine bonds issued by Autostrade, clearing another hurdle for the unit's sale.

In June Atlantia agreed to sell its 88% stake in Autostrade to a consortium comprising Italian state lender CDP and investment funds Macquarie and Blackstone to end a feud triggered by the collapse in 2018 of a motorway bridge in Genoa, run by the unit, which killed 43 people.

The sale is expected to close by the end of March but the Italian government and its authorities must first approve Autostrade's new tariff plan (PEF) and the agreement that settles the dispute over the bridge disaster. Rome also needs to give its green light to revisions to the motorway contract.

Atlantia is due to pocket more than 8 billion euros ($9 billion) from the disposal of Autostrade, which operates nearly half of Italy's motorway network. ($1 = 0.8883 euros) (Reporting by Francesca Landini; Editing by Susan Fenton)