This Peer Review focuses on SCAG’s model development program and the validation of the 2008 Regional Travel Demand Model for Southern California. The Model is being updated for use in preparing the 2012 Regional Transportation Plan (RTP). This was the fourth in a series of peer reviews conducted for the Southern California Association of Governments (SCAG) Regional Travel Demand Model. The meetings for the fourth Peer Review were held on June 27-28, 2011 in the Los Angeles offices of SCAG. An introductory teleconference among Peer Review panel members was conducted on May 26, 2011.
The Peer Review panel’s primary objective was to review the model development program, validation tests and results, expert panel discussions, and overall model enhancement effort for validity with regard to state of the practice so that the model can be applied with sufficient reliability in the regional transportation planning process. The panel’s recommendations for: 1) short-term enhancements related to the use of the model in developing the 2012 RTP and 2) longer-term model enhancements for the next RTP in 2016 are summarized in the Peer Review #4 Report. The Model is managed and operated by SCAG with development assistance from private consulting firms and academic institutions. Expert panels have overseen the development and enhancement of specific modeling components. The Peer Review panel was assembled to review SCAG’s overall model enhancements and validation process.