Modeling & Forecasting

SCAG develops and applies state-of-the-art models to support SCAG’s planning programs. These models include:

  • Trip-Based Transportation Model
  • Activity-Based Model
  • Heavy-Duty Truck Model
  • Scenario Planning Model
  • Land Use Model
  • Growth Forecast & Allocation Models
  • Air Quality Model


SCAG utilizes an integrated analytical framework (See Modeling and Forecasting Framework) to develop growth projections, travel forecasts, and emissions estimates to support the Region’s various planning programs. In addition, SCAG also maintains a robust subregional modeling and data service program that is essential to the analysis of many of the region’s projects and programs.

The primary functions of the Modeling and Forecasting Department include: a) working collaboratively with local jurisdictions to develop socioeconomic growth forecasts as required for regional and local planning; b) providing modeling services for the development and implementation of SCAG’s plans, programs, and projects; c) developing and maintaining SCAG’s various analytical tools and data to more effectively forecast travel demand and estimate resulting air quality; d) providing member services through a robust subregional modeling and data distribution program; e) promoting state of the art modeling practices; and, f) coordinating modeling activities within the SCAG Region.