HIPERTRANS was a collaborative project within the European Commission Research and Development Framework Programme IV under the then, DG VII Transport. The project developed an accurate, high speed, and visually interactive, simulator of urban transport networks within a high-performance computing environment. HIPERTRANS simulator can be used by traffic systems suppliers to test urban traffic control systems. Network operators can use the simulator to test traffic management strategies and train operators. HIPERTRANS predictor can be used by network operators to forecast the changes to traffic flows on a real road network much faster than a real life system. The main goal of the project was to produce microscopic modelling and simulation tool for the easy and cost-effective development of road traffic control systems and for the effective management of traffic flow on road networks. Specific aims were to: develop a simulator able to interact with UTC systems at real-time speeds and develop a predictor consistent with users' requirement for look-ahead; implement a low-cost high-performance system on a scaleable workstation cluster; demonstrate that the use of high-performance computer-based simulation can speed up and dramatically improve the operation of urban and inter urban transportation networks; test the real-time performance of several architectures for implementing the simulation algorithms by comparing them in terms of execution times; model road traffic on a small-to-medium sized network; and study technology and best practice for extending the simulator to handle inter-urban situations. In general, the HIPERTRANS system aimed to have the following basic functionality: performing microscopic simulation, and having a user-friendly graphical user interface (GUI); interfacing capability to UTC systems and capability of working in real time; being able to simulate and predict the state of the road traffic; and achieving a high-performance computing network (HPCN) system on low cost platforms; The technical aim of the development was to achieve the simulator in three stages as follows: a prototype simulator (S1), a real-time simulator (S2), and a real-time predictor (S3). S1 is a prototype system that is a combination of dynamic traffic models and a simulation engine that is capable of giving the current state of the traffic network. S1 operates in non-real time. S2 operates in real-time and receives traffic control signals from real UTC systems by means of an additional real-time interface. S3 is a traffic predictor that can predict the future condition of traffic within a given network as it can operate faster than real-time. S2 and S3 were aimed at making use of two different kinds of proprietary UTC systems: SCOOT, partly owned by PTL and STU, wholly owned by ETRA. The project also developed a GUI for visualising the results of the simulator and inputting road network data models into the simulator.