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13DESIGN FEATURES OF ACTIVITY- BASED MICROSIMULATION MODELS Atlanta Sacramento Bay Area Denver Dallas SE Florida ARC SACOG MTCa DRCOGa CEMDAP FAMOS 100+ combin ation of 4 household sizes, 4 household sizes, 4 household sizes, 6 hâhold types, 4 household sizes, hâhold size, no. of 4 no. of workers, 4 no. of workers, 3 no. of workers, 7 hâhold sizes, 2 dwell ing unit workers, income, 4 incomes 4 incomes, age (?) 4 incomes, age (?) 2 child ren, types, 4 vehicle and age 2 genders, 7 races, ownerships, 6 10 ages ages Yes Yes Yes Yes Yes Yes 8 7 7 or 8 7 or 8 11 for adults, 3 for children 6 1 1 1 or 2 1 1 2 Yes, simultaneous No Yes, simultaneous No Yes, sequential Yes, sequential Yes No Yes No Yes (between parent Yes and child) Yes No No No Yes Yes No No No No Yes Yes Tour Person- day and tour Person- day and tour Person- day and tour Person- day and tour Person- day and tour 2,500 1,300 1,600 2,800 4,800 3, 000 No Yes, 700K parcels Transit accessibility Yes, buildings No No subzones (?) Sequential Sequential Sequential Simultaneous Sequential Simultaneous for nonwork 4 4 5 10 5 3 1 hour 30 min 30 min (?) 30 min Continuous time, Continuous time, 1 min 1 min Yes Yes Yes Yes Yes Yes, time-space prisms Between them Between them Between them Above both Between them Above both for nonwork Yes, lowest model Yes, lowest model Yes, lowest model Yes, lowest model Yes, before Yes, lowest model stop- location Destination choice Mode and destination Mode and destination Mode and destination In person- level Timeâspace prism logsums by zoneâ logsums by zoneâ logsums by zoneâ logsums by zoneâ activity generation accessibility; modeâsegment segment segment segment models: Hansen- type modeâdestination measure logsums that location on the survey diary days. The destination for any particular work tour will most often be the usual work location but may be another location instead (a business meeting, for example), and that choice is mod- eled accordingly at the tour level. School tours nearly always go to the usual school location, so a separate school tour destination model may not be needed. In the future, it would be ideal for the population synthesis and longer- term models to be replaced by a dynamic, inte- grated land- use model that includes joint prediction of residential and workplace (re)location decisions. NUMBER OF OUT- OF- HOME ACTIVITY PURPOSES The simplest purpose segmentations are in the first ver- sion of the Portland model, with three purposes (workâschool, maintenance, and discretionary), and in San Francisco, also with three purposes (work, school, and other). Most other model systems have included at least seven activity purposes: work, school, escort (serv- ing a passenger), shopping, meals, personal business (or other maintenance), and socialârecreation (or other dis- cretionary). In some cases, social visit has been separated from recreation. The main reasons for splitting out the meal activity are that it tends to be done at certain types of locations and that it has very specific time- of- day and duration characteristics. The escort activity also tends to be to specific locations at specific times for driving chil- dren to or from school. In tour- based models, there is no need to treat nonhome trips as if they are separate pur- poses, although all the systems have separate tour- level models for work- based tours (often called subtours because they are tours within tours). In most model sys- tems, the division of the school purpose into university,