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Sergio Hidalgo, chief executive officer of OHL Mexico SAB, displays a map of the the OHL Mexico highway construction during an interview in Mexico City, Mexico, on Wednesday, May 13, 2015. OHL Mexico SAB executives caught on leaked recordings purportedly discussing ways to raise tollway rates were referring to a never-adopted plan drawn up by lower-level employees, Hidalgo said. Photographer: Susana Gonzalez/Bloomberg via Getty Images

Sergio Hidalgo, chief executive officer of OHL Mexico SAB, displays a map of the the OHL Mexico highway construction during an interview in Mexico City, Mexico, on Wednesday, May 13, 2015. OHL Mexico SAB executives caught on leaked recordings purportedly discussing ways to raise tollway rates were referring to a never-adopted plan drawn up by lower-level employees, Hidalgo said. Photographer: Susana Gonzalez/Bloomberg via Getty Images