The framework of the Travel Demand Model (TDM) updated in 2014 is complete. The TDM is not a static, unchanging, fixed planning tool. It must be maintained, updated and improved over time to remain useful and relevant. The County completed several projects, including the major 5-Year update of the Capital Improvement Program (CIP), and the Traffic Impact Mitigation (TIM) Fee Program. The TDM may be updated as additional data is received during the course of these projects.
A Travel Demand Model (sometimes referred to as a Traffic Demand Model) is a tool for analyzing the impacts of development on the transportation system. The County’s previous travel demand model (TDM) was based on a software platform with limited capability that is no longer supported. The new TDM was developed in the CUBE/Voyager platform, using 2010 Census data and updated socioeconomic data from several sources including information from the Sacramento Area Council of Governments (SACOG). The model has a forecast horizon year of 2035.
During the TDM update, County staff coordinated with Caltrans and the Sacramento Area Council of Governments (SACOG) since 2012 as part of the process to update the County’s TDM. On February 3, 2014, SACOG provided a letter of concurrence based on ongoing dialog with County staff. County and Caltrans staff have worked to fine-tune the TDM to address any remaining questions. As a result of this close collaboration, the County received a letter from Caltrans on September 22, 2014 stating their concurrence with the TDM and finding that it “conforms to the state-of-practice in travel demand modeling; meets overall traffic assignment validation standards suggested by FHWA and Caltrans; and is an appropriate tool for the County’s long range planning purposes." (See Supporting Documents for Caltrans and SACOG letters.)
Upon completion of the TDM, several peer reviews were completed by Kittelson and Associates Inc., Caltrans, and SACOG. El Dorado County staff met several times with both SACOG and Caltrans during the development of the new TDM, and continue to meet with both agencies in the ongoing effort of keeping the model up-to-date.
The new TDM is an essential tool for implementing the General Plan goals and policies, updating the Zoning Ordinance, planning of new roadways for the Capital Improvement Program (CIP), and updating Traffic Impact Mitigation (TIM) Fees. The TDM will help guide the County through the next twenty-five years of land use planning. The new model will be not only be used by the County but also by private companies and public agencies such as Caltrans. The County intends to keep the model current, updating it as needed to incorporate new development. The latest update was completed in August 2018.
For a comprehensive list of Items presented to the Board on the TDM, click on the Board of Supervisors Agenda Items tab.
Board of Supervisor Agenda Items
Please note: These agenda items may not reflect the most current information and are subject to change. For the latest information on agenda items related to this project, refer to the County online agenda calendar:
Travel Demand Model Assumptions, Methodology, and Reports
Other Related Documents
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