DTA Framework for Integrating Activity-based Model
Jordi Casas, TSS-Traffic Simulation Systems and Vic University, Josep Maria Aymamí,, TSS-Traffic Simulation Systems, Josep Perarnau, TSS-Traffic Simulation Systems
The objective of the current paper is developing a generic framework for integrating the Dynamic Traffic Assignment with Activity-based models
The paradigm employed during the last decades on transport modeling has been the traditional trip based approach, but, currently, due to the limitations of traditional planning for short-term policy analysis, researchers are incorporating more behavioral aspects in planning methodologies. On the demand side, activity-based models are appearing as alternative methodology to traditional trip-based transportation demand, and, on the supply side, the dynamic traffic assignment models have been developed as an alternative to static assignment approach. Unfortunately the evolution of Activity-based models and dynamic traffic models has been evolving relatively independently. However, researchers are considering to maximize the benefits from both methodologies combining them in a unified or integrated framework.
The objective of the current paper is developing a generic framework for integrating the Dynamic Traffic Assignment with Activity-based models focusing on aspects related to the demand definition in terms of activities, where each element describes a unique person with particular characteristics, such as value of time, expected travel time, starting time of the activity, etc. Another relevant aspect for remarking is the path selection models associated to the dynamic traffic assignment process dealing with individual value of time instead of using the traditional approach of taking an average.
While the framework is general in nature, specific technical details related to the integration are explored by employing a generic Activity-based model with Aimsun for the Dynamic Traffic Assignment, and focusing on a show-case for assessing an evacuation plan. This show-case describes the interaction between the evacuation plan, where each person is described with its trip chain and transport modes, and the dynamic traffic assignment model based on a mesoscopic simulation.
Key words: Dynamic Traffic Assignment (DTA), Activity-based Model (ABM), traffic simulation models, Aimsun
Association for European Transport