Abstract
This chapter briefly summarizes and reviews the current generation of operational activity/tour-based model systems. These model systems are developed to varying degrees within an agent-based microsimulation (ABM) framework. ABM provides an extremely flexible, powerful, and efficient means for modelling complex spatial-temporal, socio-economic behaviour such as travel. A high-level definition of microsimulation in general and agent-based microsimulation in particular is presented. Overall, currently operational activity/travel model systems represent a sound “first generation” of such methods, but they are far from realizing the full potential of the ABM concept. A wide range of issues and challenges in advancing the ABM-based activity/travel modelling state of the art are discussed, leading to a few suggestions for key “next steps” in model development.
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Notes
- 1.
The same holds true for bicycles, which are also, in principle a “tour-based” travel mode.
- 2.
A notable exception to this general statement is the TASHA model, which is the operational travel demand forecasting model for the City of Toronto.
- 3.
Although deterministic simulation models also exist.
- 4.
Work and school location choices/allocations for workers and students are also a major modelling challenge. For the purpose of this chapter, which is focussing on modelling day-to-day activity/travel, we assume that work and school locations are determined exogenously to the activity/travel model, through longer-term labour market (place of residence—place of work) and school participation (place of residence—place of school) models.
- 5.
Exceptions, of course exist. Service workers (plumbers, etc.) and salespersons may have no fixed place of work, travelling each day to wherever their clients on a given day are located; construction workers move from site to site on a frequent basis, etc. But these special cases should be dealt with as such (and certainly are not in current operational models). For most workers, their primary work location is still determined by a longer-term work participation process.
- 6.
And, in principle, the bicycle and pedestrian networks as well, although bicycle and pedestrian route choices are rarely, if ever, explicitly modelled in operational models to date.
- 7.
Of course, this planning may go down to the level of the minute (or a few minutes), but the overall scale of the problem is at the level of the day.
- 8.
In this discussion, it is assumed that we are only concerned with out-of-home episodes. In-home episodes are briefly discussed in Sect. 4.8.
- 9.
And/or “gap” in the current provisions schedule, as briefly discussed in Sect. 4.4.
- 10.
An episode’s end time equals its start time plus duration, so only two of these three attributes are independently determined. While an ending time may sometimes be the primary consideration for scheduling a given episode (I need to be home by 5 pm), it is generally assumed that start time and duration are generally the more “primary” attributes.
- 11.
As per above, it is assumed herein that work and school locations are known. Locations for non-work/school locations, however, are assumed to be chosen as part of the activity episode generation/scheduling process.
- 12.
In such models, trip start time is usually determined by either subtracting the expected travel time from the desired start time of the activity episode being travelled to, or adding the travel time to the activity episode end time if one is leaving this episode to travel to another location.
- 13.
The occasional “all-nighter” getting a term paper done, “partying ‘till the cows come home”, etc. notwithstanding.
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Miller, E.J. (2019). Agent-Based Activity/Travel Microsimulation: What’s Next?. In: Briassoulis, H., Kavroudakis, D., Soulakellis, N. (eds) The Practice of Spatial Analysis. Springer, Cham. https://doi.org/10.1007/978-3-319-89806-3_6
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