A recent push from the local government to help residents facing public service hikes has left a US$40mn hole in the project's budget.
Eclac's executive secretary Alicia Bárcena recommends to look at other alternatives for the construction of a new airport for Mexico City.
Notices will be scrutinized to detect any evidence of illegalities.
The transportation sector is the area with the largest investment deficit, according to a consultancy.
With limited capacity to invest in infrastructure due to a tight fiscal situation, Brazil's government is trying to attract more players, including the private sector, to invest in the segment in the coming years.
The works in Tucumán province have been stalled since 2015. The contract is expected to be tendered next month and entails a total of 887km.