This page contains a Flash digital edition of a book.
TECHNOLOGY Microsimulation


constantly monitors and forecasts the traffic status and optimises the control strategy according to flow efficiency and/ or environmental criteria. This gives high performance even with unpredictable traffic conditions. UTOPIA offers unmatched perform-


ance. Field trials in Verona and other cities have demonstrated the following benefits: • 15 per cent decrease in travel times for private traffic;


• 50 per cent reduction in queuing time; • 10 per cent decrease in emissions and fuel consumption in urban areas.


A range of strategies are available: from plan selection to traffic responsive and fully adaptive, to permit the ideal solu- tion for each specific site. UTOPIA has a hierarchical and dis-


tributed architecture consisting of a higher level (centre), that is responsible for setting the overall control strategies, and a lower level (controlled junctions) where the traffic light control is imple- mented by means of a specific software, called “SPOT”.


DYNASIM AND UTOPIA In Cube Dynasim users can control simulation signals via external applica- tion, creating a connection with external programs. Computing data received by the microsimulator (state of detector), the external program calculates the sig- nals state and send it to Cube Dynasim. Among others, Cube Dynasim has an appropriate interface with the sig- nal optimization system UTOPIA: this function makes possible to validate the scheduling of a controller or a real-time centralized system while avoiding the complications and costs inherent to on- site experiments. In the integration with UTOPIA, Cube


Dynasim has a double function: micro- scopic simulation software and Proxy: • As a simulator, Dynasim represents the real traffic conditions, by mean of traf- fic flows, and sends the information to the SPOT software;


• As a proxy, Dynasim acts as the 22 Final traffic circulation plan thinkinghighways.com


interface between the simulator and the different SPOTs.


The communication is made through specific IP addresses and port numbers. For this reason the UTOPIA Central and Local units as well as Dynasim can be installed and run on different PCs on a WAN. In order to evaluate and fine tune sig-


nal plans, the simulation scenarios have been run connecting the simulation soft- ware with the UTOPIA system: • To understand how well the predefined (ordinary conditions) UTOPIA plans performed in these new situations;


• To evaluate possible changes in the UTOPIA plans;


• To determine the level of congestion of the analysed junctions;


• To instruct and guide the local munici- pality police about potential critical situations.


STUDY EXPERIENCES The integration between Cube Dynasim and UTOPIA proved to be extremely efficient in order to define, off-line, the best possible strategies for avoiding live ‘trying and failing’. Some observations: • The simulation model gave results coherent with the actual flows and conditions observed after the implementation;


• The scenario-based simulation model proved a very efficient way of achiev- ing minimal delay;


• The implemented schemes helped achieving acceptable congestion levels throughout the works period.


Another important aspect provided by this type of simulation, is the chance to communicate planned changes to politi- cians and to the public, informing them about expected congestion levels during periods of major road works.


||||||||| |||||||| ||||||||


 Tor Vorraa is Regional Director, Ciitlabs


tvorraa@citilabs.com


Comune di Verona, Traffic Control Center: Arch. Bruno Pezzuto – traffico@comune.verona.it


Swarco Mizar: Maurizio Pasquero – maurizio.pasquero@swarco.com


Citilabs: Daniele Romanò – dromano@citilabs.com


www.citilabs.com Vol 8 No 2 Europe/Rest of the World |||||||||


Integration between Dynasim and Utopia


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84