The plan is part of the current administration's goal to increase public transport use through 2020.
Initiative is expected to require spending of US$20mn, and it comes after heavy storm surges caused floods in the tourist hotspot.
The Cuernavaca Paso Exprés highway opened in April following a four-month delay.
The credit lines will focus on small and medium sized projects, which may be less likely to attract private investors.
The claims, that OHL had contributed illegally to the México state governorship campaign, were filed separately by a local civil society group and an opposition party.
An inter-agency agreement was signed by national infrastructure agency ANI and Bogotá's urban development institute IDU.
A modification in the design of the bridge could cost the Chilean state an additional US$15mn. Critics claim that company responsible for the construction should pay the additional cost.