The Transportation Development Act (TDA) is administered by Regional Transportation Planning Agencies (RTPA) such as the Sacramento Area Council of Governments (SACOG). It provides two major sources of public transportation funding in California.
Local Transportation Fund (LTF), enacted in 1972
State Transit Assistance (STA) fund, enacted in 1980
Explanations of both of these funds and annual apportionments for each jurisdiction are provided in the document TDA Apportionment, which SACOG publishes annually.
Specifics on TDA statute can be found in the Transportation Development Act Statutes and California Code of Regulations published annually by Caltrans and can be accessed through http://www.dot.ca.gov/hq/MassTrans. SACOG has also adopted specific guidelines for regional TDA implementation detailed in Transportation Development Act Guidelines. A detail description of the law and the funds are described in the introduction of the Guidelines. TDA claimants: TDA claim forms and STA calculations are available as Appendix E of the Guidelines.
Part of SACOG's responsibility under TDA is to conduct an annual Unmet Transit Needs process to determine whether jurisdictions allowed to use the remaining TDA funds for streets and roads projects can do so and identify new transit needs in the region. Annual public hearings are held to collect public testimony on transit needs.
(Translation is provided by Google, and may not be 100% accurate)
The Transportation Development Act (TDA) is administered by Regional Transportation Planning Agencies (RTPA) such as the Sacramento Area Council of Governments (SACOG). It provides two major sources of public transportation funding in California.
TDA claim forms and 
STA calculations are available as Appendix E of the Guidelines.
