Planning Terms (S - Z)

The Transportation Planning Dictionary provides definitions to transportation planning's most curious acronyms and jargon.

  • SCS (Sustainable Communities Strategy) - Senate Bill 375 (SB 375) requires all MPOs to develop an SCS.  An SCS is a regional land use and transportation plan aimed at reducing GHG emissions from cars and light trucks sufficient to meet regional air quality targets set by the California Air Resources Board.
  • SRTA (Shasta Regional Transportation Agency) - SRTA is the federally-designated MPO, and state-designated RTPA, for Shasta County.  SRTA is responsible for transportation planning and programming, developed in cooperation and consultation with local agencies, intergovernmental partners, and the public.
  • SSTAC (Social Services Transportation Advisory Council) - As outlined in the California Public Utilities Code Section 99238, this group advises the SRTA on transit issues, coordination of specialized transit services, the annual unmet transit needs recommendation and implementation of the Americans with Disabilities Act.
  • STA (State Transit Assistance) - Provided for under TDA, STA is funding assistance specifically for transit operating and capital that is derived from the sales tax on diesel fuel.
  • STIP (State Transportation Improvement Program) - A five-year program identifying all transportation improvement projects for which the California Transportation Commission has funding approval authority.
  • TDA (Transportation Development Act) - Enacted in 1971 by California voters, TDA provides two major funding sources for the development and support of public transportation: Local Transportation Funds (LTF) and State Transit Assistance (STA).  TDA also originated the designation of RTPAs.
  • TDM (Travel Demand Model) - Travel forecasting models are used to predict changes in travel patterns and the utilization of the transportation system in response to changes in regional development, demographics, and transportation supply.