Version_14_2_2_updates

Among the version 14.2.2 improvements, the warm start trip table bug fix [ABM-1382], the speed calculation bug fix [ABM-1380], and the skimming procedure added after the final assignment [ABM-1379] affected model results. Staff conducted a soft base year calibration and validation to align model estimated results with observed data. Most base year calibration and validation metrics are comparable between versions 14.2.1 and 14.2.2, some metrics, such as VMT and highway AM and PM peak period volume, validation results improved for 14.2.2. A SANDAG peer review panel (PRP) reviewed and approved the use of ABM2+ version 14.2.2 for final 2021 RP modeling.

The following documents describe version 14.2.2 updates in detail:

• Version 14.2.2 PRP Memo - describes the adjustments, bug fixes, and test results.
• VDF Adjustment Memo by RSG - describes the parameter adjustments of volume delay function (VDF).
• 2016 Base Year Validation Results - describes base year validation results in a StoryMap.
• Version 14.2.2 Release Report - describes software improvements and bug fixes.