On June 11, 1997, two Framework Agreements were signed between the Basque Government, the Biscay Provincial Government, the Bilbao City Council, and the Biscay Transport Consortium.

One of these agreements, the one signed to undertake measures to coordinate public passenger transport fares, saw the need to evolve towards coordinating the existing fare systems through concrete measures that would guarantee a principle of coordinating fare and would benefit those who use the transport services.

The second agreement, designed to undertake measures to restructure public passenger transport, envisions, as a step prior to beefing up public transport, a concerted effort to streamline the supply of transport whereby overlapping between the different modes of transportation could be eliminated.