Master Transportation Plan Medium-Term Modeling Analysis
Figure 3: Matrix Interpolation for 2023 matrix
3.2 Model Calibration A key step in the methodology was calibrating the regional model to local traffic conditions. Since the regional model is validated at a macro scale, a local calibration effort was necessary to support accuracy in the CoFW project area. Furthermore, NCTCOG’s model is calibrated for the base year, which is 2019. As this is a pre-pandemic year, and in the medium-term travel patterns have been affected posterior to Covid-19, the consultant team decided to use a further year as the base calibration year for the medium-term analysis of M1M project. Based on consistent availability of data, the year 2023 was selected. The calibration process is shown in Figure 4. It consists of four main steps: • Step 1: Count Data Preparation. This task includes all the post-processing steps needed to produce target by vehicle class for all the locations used for the calibration process. • Step 2: Origin-Destination Matrix Adjustment (ODME), which is a process in which TransCAD runs iterative matrix adjustments and assignments to match traffic volumes set as targets (i.e., count data). • Step 3: Select-Link Analysis (SLA) for global adjustments of key locations. This process identifies locations of the network of interest for medium-term and long-term analysis (e.g., bond projects) and runs adjustment queries for these locations. • Step 4: Target SLA for key locations. After all the global adjustments finished, some locations
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