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The model was originally developed in 1973 as part of the first CIS. ft was used toinvestigate all aspects of transport ranging from assessments of different landdevelopment policies to analyses of detailed traffic management problems. Some ofthese original functions have since been taken over by other transport models,themselves developed from the original CIS model, so that a 3-ieve! hierarchy ofmodels and studies has evolved:Level Purpose Model ApplicationLevel 1 Strategic land use LUTO 1 Strategic land usedevelopmentdevelopment planning takinginto account transport projectand policy requirementsLevel 2 Strategic transport CTS-2 Identify strategic transportproject programmingproject and policyand policy formulationrequirements of land usedevelopment recommendedin Level 1 studiesLevel 3 Regional transport Various District trafficplanning andanalysistraffic management1 Land Use Transport OptimisationThus the CTS-2 transport model now occupies the second level of the hierarchywith the function of modelling transport demand over the entire Territory transportsystem in sufficient detail to evaluate transport projects and policies.The relative level of detail of each model can be judged by the number ofsub-divisions or zones into which the Territory is divided to represent locations ofpopulation and employment. The final CTS-2 model operates with 232 zones for thebase year of 1986 (expanded to 238 zones to allow for new major development sitesup to 2001), reduced from the 383 zones defined for the original CTS. For the moredetailed Level 3 studies, each CTS zone in the area of interest would normally besub-divided into three or four sub-zones. In contrast, the Level 1 LUTO model usesonly 49 zones for the entire Territory; for example, Hong Kong Island is representedby just 7 zones in the LUTO model compared with 55 in the CTS-2 model.An important initial task of CTS-2 was to overhaul the CTS model and adapt it betterto its new role. This process included:(1) Adjustments to reflect the most recent data on travel patterns.(2) Incorporation of improvements in modelling techniques as developed in HongKong and elsewhere.(3) Reorganisation and simplification of the model structure to reduce computerrunning times(4) Expansion of the model to include economic evaluation procedures.Preparation for Transport TestingThe projections of future transport demand depended on the assumptions of futuredevelopment of the Territory and its transport system, it was necessary to collate allthis information and prepare it in a form suitable for input to the model. In all caseswhere choices had to be made, the Study team prepared technical papers fordiscussion with the Study Working and Steering Groups, setting out the options andmaking recommendations, The main tasks are listed below.25