Some very cogent points against the concept of private toll roads

In the Economist's Buttonwood blog:

given that the construction, maintenance and operation of roads is typically contracted out to the private sector anyway, what value is added by transferring traffic risk to a private sector owner? The government - through its traffic management and transport planning functions - is uniquely placed to manage traffic risk. Transferring to the private sector risks that are not within their control simply increases the cost of finance unnecessarily;

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