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Using the simulation GWTOOL program, a PC application that realizes the time distance diagrams for consecutive intersections, we can simulate the “green wave”for an intensively circulated artery that transits the city, in north-west, towards east south. The traffic fluctuations, the existing programs, the time offsets between intersections at the beginning of the “green light period” inside the program, and the actual measurements realized in the major interest areas on this artery have been also taken into consideration. 1. Deffining of flows data The flow represents the road section through which a vehicle travels, this being limited between different “Stop Points” (the horizontal red lines from intersections). In the example below two more flows are presented: from the top to the bottom (the yellow line on the map) for a direction (called flow down) and from the bottom to the top (the blue line in the image) for the other direction (called flow up). The flow down has two “Stop Points” and on the the other flow, the flow up, there is only one “Stop Point.” As each and every segment before the “Stop Point” must be identified, the start point of the case study (the green wave) has been indicated by a red dotted line. For adding a new flow, right click on one of the flows (flow up – the direction going upwards) and select “Add flow entry.” On the lower left side of the program (the controllers’area) there will appear frames where you can complete the following: Controller: this frame is used for selecting the controller that monitorizes the semaphore from the stop point. Light: this frame is used for selecting the semaphore (semaphores) of the desired flow monitorized by this controller. Distance: the distance in meters from the beginning of the section. Speed: the medium speed is introduced on this road section. If we analyze the green wave for only one flow then, only one of the flows will be introduced. If we analyze a green wave on two flows, then the afferent data for both flows must be introduced. In addition, at the end of the segment chosen for the accomplishment of the green wave, a buffer road segment must be added, having the same length as the one at the beginning of the green wave. In order to modify the data of the flow, right click on the respective flow and the data can be modified from the frames appearing in the lower left part of the program. Options:In the tab “Options” the following setting can be modified: ANNALS of the ORADEA UNIVERSITY. Fascicle of Management and Technological Engineering, Volume IX (XIX), 2010, NR2

GENERATING "GREEN LIGHT" SIMULATION IN VEHICLES TRAFFIC USING THE GWTOOL SOFTWARE