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Travel Model Documentation

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The links below provide SACOG’s travel model documentation, updated to reflect the SACSIM19 travel demand model used for the 2020 MTP-SCS.

Please send any questions or comments to sacsim@sacog.org

Full Model Documentation

Overview and Introduction

Model Structure

Land Use

4 Land Use Data

4.1 Land Use for SACSIM Introduction

4.2 Land Use Data Files

4.3 SACSIM Parcel-Point Structure and Variables

4.4 Parcel Variables

4.5 SACSIM Land Use Spatial Association

4.6 SACSIM Parcel Land Use User Guide Setup

5 Representative Population Data

5.1 Land Use Scenarios

5.2 Household Population Demographics

5.3 Base Year Household Population Demographics

5.4 Future Year Household Population Demographics

Networks

6 Highway Networks

6.1 Opening and Editing the Highway Network

6.2 Capacity Class

7 Transit Networks

7.1 Working with the Transit Network

7.2 Transit Lines

7.3 Transit Access Coding and Network Additions

7.4 Transit Travel Speeds and Stop Times

7.5 Park-and-Ride Locations

8 Bike and Walk Networks

8.1 Coding Bike Facilities into the Highway Network

8.2 Building Bike and Walk Skims

8.3 Estimating Bike and Walk Trip Distances

Auto Operating Cost, Fares, and Pricing

Calibration and Validation

10 Model Equilibrium

10.1 Background and Concepts

10.2 SACSIM19 Equilibrium Solution Procedure

11 Sensitivity Training

11.1 Introduction

11.2 Experimental Testing of Key Exogenous Input Factors

11.3 Cross Section Testing of Land Use Transportation Factors

11.4 Testing of Random Variation in Model

11.5 Facility-Based and Pay-as-You-Go Pricing Testing

12 Validation and Calibration

12.1 Observed Travel Data

12.2 Model Calibration

12.3 Model Validation and Reasonableness Check

Appendices