An Integrated UTCS/AVM Pollution Control System
CAMUS R and LONGO G, University of Trieste, Italy
The traffic behaviour in the central areas is often characterised by relevant problems due to traffic congestion, air pollution, noise, etc. In many cases congestion and pollution levels are not more acceptable and it is then necessary to perform some act
The traffic behaviour in the central areas is often characterised by relevant problems due to traffic congestion, air pollution, noise, etc. In many cases congestion and pollution levels are not more acceptable and it is then necessary to perform some actions which may affect the whole transportation system. As it is in general not possible to increase the existing supply of the urban centres, it is usually necessary to reduce the car flows in order to improve traffic conditions and the life quality. This goal may be reached on one side through strategies based on traffic limitations (pedestrians zones and so on), on the other side both through the increase of the attractiveness of other transportation modes (for example the public transport) and through other dynamic control strategies. In some cases it is necessary also to adopt actions to reduce the pollution in central areas even where congestion is not a problem.
So both congestion and pollution limitations may be reached either through structural actions and/or through innovative management strategies, which perform a dynamic pollutant level monitoring and control. In this paper a pollution control system is presented, which is based on an advanced Automatic Vehicle Monitoring system (AVM) integrated with the Urban Traffic Control System (UTCS). This system has been designed for the city of Trieste and it is now in an advanced phase of implementation. In this case congestion and pollution monitoring is carried out through the use of both fixed and mobile sensors. The first kind of instruments is well known, while the mobile sensors represent an innovative upgrade of the functions provided by an AVM system. Some details on the technological aspects have been already presented in (Camus R., et al. 1997).
In the following paragraphs the monitoring system is described at first, with particular attention to some results obtained using mobile sensor devices. The features of the AVM and of the UTCS system are then discussed. Finally the whole control system is described and a theoretical method is presented to calculate the steady state flows on internal links of the network, if the flows on input links and the turning ratios matrices are known. So it is possible to evaluate the effect of the each flow entering the network on the total flow present in the internal links. Using the relationship between the flow and pollution it is then possible to control the pollution level by reducing cars entering the network.
Association for European Transport