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Transport Planning Studies1.1.15 While embarking on this massive transport construction programme, it was alsobeing recognised that Hong Kong could not accommodate unrestricted growth oftraffic and that priorities had to be established among road users. It was furtherappreciated that transport interactions are complex and need detailed study to beable to determine the outcome of policies accurately. From these concerns emergedthe first Comprehensive Transport Study (CIS) in 1973. The task of CTS was toestablish the analytical tools to evaluate transport proposals and to use these tools todevise a balanced programme of transport projects and transport policies. The CTSprogramme based on this work was published in 1976.1.1.16 Following the first CTS, a great number of studies were undertaken which wereconcerned with detailed transport planning issues, or which had strong transportplanning elements. It is estimated that some ten to twenty studies were completedeach year in the period 1976-1988.1.1.17 The main categories of study can be identified as follows, with examples:(1) Transport Department studies and surveys undertaken on a regular basis, e.g.the Annual Traffic Census.(2) Planning studies of specific routes and corridors, e.g. the Feasibility Studyof Alternative Transport Development in the Sha Tsn-Tsuen Wan Corridor(1981).(3) A series of sub-regional studies associated with the development of theTerritorial Development Strategy, e.g. the Harbour Reclamation and UrbanGrowth Study (1983).(4) Studies of the transport requirements of New Towns, e.g. the Junk BayTransport Review (1984).(5) District studies to develop local transport plans within the context of the overalltransport strategy, e.g. the Western District Traffic Study (1987).(6) Public transport studies, e.g. the series of Development of an Integrated PublicTransport System (DIPTRANS) studies to forecast public transport requirementsin conjunction with the development of the Mass Transit Railway(1979-1983).(7) Policy studies, e.g. studies in connection with the taxi policy reviews (1983 and1987).1.1.18 The common element running through most of these studies was the use made ofthe computerised transport forecasting model, originally developed in the first CTSand since maintained and periodically updated by Government and consultants. Inmany cases, the model was modified to meet the particular needs of a study; many ofthese changes have now been incorporated in the main version of the model. It isrecognised that there will be a need for the model to continue to be modified as andwhen necessary after the completion of CTS-2.1.1.19 Many of the major assumptions adopted in the various transport planning studiesare continually updated in the course and after the completion of the studies. Theseinclude the projections of population, employment and economic growth. Duringthe study period of CTS-2, there have been several updates of these projections.Even at the beginning of the Study, it was not conceived that the airport at Kai Takwould be relocated before 2001. It is now considered that a new airport is highlylikely by then. All of these changes in study assumptions reinforce the need ofregular updating of the CTS-2 results.15