The decision to implement the South Bay Expressway on a P3 basis was a direct result of AB 680. The bill called for Caltrans to issue a Request for Statements of Interest for up to four transportation projects to be financed by private investors under a demonstration program. Although it stipulated that at least one of those projects be located in Northern California and a second in Southern California, prospective investors were invited to identify projects they felt would be of greatest benefit to the state. The State also gave preference to project proposals that were consistent with the local and state long-range transportation improvement plans. This led CTV to propose building the SBX as a toll road and implement a needed highway for which no other funding had been identified.