Transferability and updating of disaggregate travel demand models
Bowman conducts development projects to implement activity-based models on the Day Sim software platform for the client's geographical region.He will serve as prime contractor, working in partnership with your technical model developers and any subcontractors as needed.
(Sacramento) --partially joint half tours (e.g., when a parent drops off a child at school on the way to work.) (Seattle and Copenhagen) --transit and bicycle mode combinations, including bike-park-ride-walk, bike-park-ride-bike, and bike-on-board (Copenhagen) Enhancements currently under consideration include: --automated base year calibration and future year pivoting within Day Sim using base year trip matrices --incorporation of shared mobility services (car share or bike share) --incorporation of autonomous vehicles Bowman can provide instruction in all aspects of activity-based models.The estimation-based approach yields encouraging results in favour of model transferability, with a majority of the coefficients in a pooled model found to be transferrable.Pooling data from different geographical contexts appears to help in developing better transferable models but careful attention is needed in selecting the geographical contexts to pool the data from.Here are the reports from those studies (pdf files).Tampa Bay region (2008): Activity-based model design and workplan SCAG (2009): Strategy for Activity-Based Travel Demand Model Development with Travel Survey Danish Road Directorate (Vejdirektoratet) (2014): Requirements and designs for incorporating bicycling into the Copenhagen Day Sim Activity-based model.The paper examines alternative updating methods for temporal transfer by imagining that only a sample of 2001 data is available.
The sensitivity of the performance of the updated models to the 2001 sample size is explored.
This paper presents an empirical assessment of the spatial transferability of tour-based time-of-day choice models across different counties in the San Francisco Bay Area of California.
Model transferability was assessed using two different approaches: (1) estimation-based approach, and (2) application-based approach.
In some cases he also manages the project, processes the input data for model development, and technically guides the other aspects of the project.
In all cases, he coordinates the Day Sim software implementation with RSG, Inc, which shares copyright of the Day Sim software with him and houses the Day Sim code repository encompassing all Day Sim implementations.
Past clients include Denver Regional Council of Governments, Puget Sound Regional Council and Danish Road Directorate.