The basic objective of the project is to build up a traffic simulation system suitable for testing RTI systems in large urban areas.
The main aim of the research was to build up a traffic simulation system suitable for testing a selected set of road transport informatics (RTI) systems in large urban areas. The simulation software developed will be able to estimate quantitative effects and make predictions of the impact of RTI systems including route guidance, advanced control systems governing traffic lights, variable message signs, tidal flow systems, artificial intelligence (AI) systems for traffic control, etc.
From the conceptual structure of the proposed system the work has been organised logically into 3 levels:
the development, integration and testing of the system shell (a transportation network database, a set of graphic tools and a set of user interfaces interfacing the scenario into which the RTI system will be simulated);
the development, integration and testing of software interfaces linking the simulation systems to the system shell;
development of improvements and new modelling capabilities in the simulation system components to deal with the simulation of RTI systems.
A prototype working system has been completed.
The new simulation software will be able to estimate the quantitative effects, and make predictions of, the impact of the introduction of RTI systems (such as route guidance, advanced control systems governing traffic lights, variable message signs, tidal flow systems, artificial intelligence systems etc).
The new simulation system will be based on various existing macroscopic type traffic models, and since none of the existing models has been designed to simulate traffic behaviour under RTI conditions, various improvements and extensions on various existing models will need to be developed and tested in order to fill this gap.
The various tasks of the project will include the following:
a) State of the art survey of existing simulation systems for large urban areas (including an investigation of their adequacy for modelling the effects of the introduction of RTI systems and of any changes that would be required),
b) Definition of the requirements for the incorporation of RTI systems in traffic simulation models,
c) Implementation of extensions and changes to existing traffic simulation systems in order to deal with RTI introduction requirements. Such extensions and changes might include:
- alternative assignment strategies,
- modelling the variability of traffic flows,
- dealing with guided and unguided vehicles,
- handling of multiple vehicle types or conditions,
- dealing with driver information systems,
- provision of linkage between signal control and route guidance,
- pollution and fuel consumption sub-models,
- modelling car-park choice with and without information systems.
d) Improvements in the components of simulation systems such as:
- modelling congestion,
- network decomposition/network aggregation assignment,
- non symmetric assignment capability,
- non equilibrium modelling,
- time dependent assignment.
e) Integration of microscopic concepts into the macroscopic system of models described above and checking the consistency of such integration.
f) Systems testing and integration, calibration, validation and documentation.
g) Implementation of software environment components such as user/system interfaces, graphic tools, etc.
The project overlaps with two other projects - V1046 FRIDA and V1052 ICARUS - which are also partly working on DRIVE Workplan tasks T202 and T205. Effective coordination and exchange of data and results amongst the three projects should be attempted through the concertation meetings and other forms of contacts.
A ready-to-use integrated traffic simulation system for testing RTI systems in large urban areas complete with user manual.
RG11 6AU Crowthorne