Major changes since TM1.5
Work from home
Implement telecommuting (also known as working from home or WFH) into a simple "submodel" of the Coordinated Daily Activity Pattern model. For each worker (with a work location), that worker's choice to work from home is made via a linear function based on the log of the person's household income; the model specification is additionally segmented by home county and employment industry. These models were estimated using post-pandemic PUMS data.
Since the worker's employment industry is unknown, the worker's work-from-home probability is the weighted average of employment industry jobs at that worker's work location TAZ.
The work from home choice (wfh_choice) is stored as a person attribute, and written to the disaggregate person output file.
More information can be found here: Asana task: WFH model adjustment & validation - this is internal only.
Coordinated Daily Activity Pattern model calibration
Previously in TM1.5 the WFH workers were modelled within the CDAP universe. With the new "Simple WFH model" in TM1.6, WFH workers are taken out of the CDAP universe so we need more of the remaining workers to travel to work. This calibration ensured the number of workers going to work remain unchanged between TM1.5 and TM1.6. More information can be found in utilities/telecommute/calibrate_CDAP_WFH
Mode choice
Since the mode choice models were estimated/calibrated to pre-pandemic data, the original specification has embedded within it pre-pandemic mode choice behavior. As such, the following configuration has been added to represent post-pandemic changes to mode choice:
- Split
SharingPrefFactorinto Work vs NonWork and make this transit-hesitance specific (e.g. remove application to TNC mode choice utility). These are now calledWork_Transit_HesitanceandNonWork_Transit_Hesitance - Add
BART_Transit_Hesitance(despite its name, this factor is being applied to BART, Caltrain and ferry in TM1.6)
California HSR Demand
Updated forecasts of access/egress trips to/from Bay Area CAHSR stations have been incorporated. Detailed documentation can be found in the high-speed-rail-external-demand/Readme and in the Asana task: Update interregional rail (CAHSR) travel assumptions - this is internal only.
Model calibration/validation
The focus of the model calibration/validation effort has been on accurately representing the change between 2015 and 2023
- Roadway valdiation using data from Caltran's Performance Measurement System (PeMS)
- Transit validation using data from the National Transit Database
Full Changelog: TM1.5.2.6...TM1.6.0