Abstract: To understand,collate and compile the traffic noise information on a territory wide basis so as to identify,quantify and analyse the scale of the problems and then evaluate relevant mitigation mea-sures,a fusion of novel technologies such as geographic information system (GIS),large-scale computa-tional noise modelling,three-dimensional (3D) visualization tools,etc.,have been utilised to develop a 3D GIS based territory wide noise model. From the resulting traffic noise exposure maps,as well as the help of the GIS software,detailed population database and statistical method,the number of people affected by each levels of road traffic noise in each districts are all determined. These all help to evaluate the problem and formulate the future noise mitigation measures and comprehensive plan to tackle the problem. This paper describes the novel technologies such as the GIS technologies,the 3D large-scale noise modelling and the methods used to calculate the population affected by road traffic noise.