The Highway Safety, Traffic Reduction, Air Quality, and Port Security Bond Act of 2006, approved by the voters as Proposition 1B on November 7, 2006, authorized $1 billion to be deposited in the State-Local Partnership Program (SLPP) Account for allocation by the California Transportation Commission over a five-year period to eligible transportation projects that were nominated by an applicant transportation agency. The Bond Act required a dollar-for-dollar match of local funds for an applicant agency to receive state funds under the program.

The Commission programmed 257 projects through the end of the five-year State-Local Partnership Program period that ended in June 2013. During the five cycles, the Commission approved 279 allocations for a total of $981 million, with $19 million set aside for administration. By law, no further allocations can be made from the State-Local Partnership Program Account. The Commission’s role is now limited to project delivery and accountability.

As of the end of FY 2017–18, construction of 240 of the 257 programmed projects was completed, 205 Final Delivery Reports were submitted, and 17 projects are still under construction.