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D E S I G N F E AT U R E S O F A C T I V I T Y- B A S E D M I C R O S I M U L AT I O N M O D E L S 13 Atlanta Sacramento Bay Area Denver Dallas SE Florida ARC SACOG MTCa DRCOGa CEMDAP FAMOS 100+ combination of 4 household sizes, 4 household sizes, 4 household sizes, 6 h'hold types, 4 household sizes, h'hold size, no. of 4 no. of workers, 4 no. of workers, 3 no. of workers, 7 h'hold sizes, 2 dwelling unit workers, income, 4 incomes 4 incomes, age (?) 4 incomes, age (?) 2 children, 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 Timespace prism logsums by zone logsums by zone logsums by zone logsums by zone activity generation accessibility; modesegment segment segment segment models: Hansen-type modedestination measure logsums that location on the survey diary days. The destination (workschool, maintenance, and discretionary), and in for any particular work tour will most often be the usual San Francisco, also with three purposes (work, school, work location but may be another location instead (a and other). Most other model systems have included at business meeting, for example), and that choice is mod- least seven activity purposes: work, school, escort (serv- eled accordingly at the tour level. School tours nearly ing a passenger), shopping, meals, personal business (or always go to the usual school location, so a separate other maintenance), and socialrecreation (or other dis- school tour destination model may not be needed. In the cretionary). In some cases, social visit has been separated future, it would be ideal for the population synthesis and from recreation. The main reasons for splitting out the longer-term models to be replaced by a dynamic, inte- meal activity are that it tends to be done at certain types grated land-use model that includes joint prediction of of locations and that it has very specific time-of-day and residential and workplace (re)location decisions. 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 NUMBER OF OUT-OF-HOME ACTIVITY need to treat nonhome trips as if they are separate pur- PURPOSES poses, although all the systems have separate tour-level models for work-based tours (often called subtours The simplest purpose segmentations are in the first ver- because they are tours within tours). In most model sys- sion of the Portland model, with three purposes tems, the division of the school purpose into university,