The slider value represents the percentage of the way through each cycle at which the light should change. GRID-SIZE-Y - sets the number of horizontal roads there are (you must press the SETUP button to see the change)ĬURRENT-PHASE - controls when the current light changes, if it is in auto mode. GRID-SIZE-X - sets the number of vertical roads there are (you must press the SETUP button to see the change) This allows you to increase or decrease the granularity with which lights can automatically change. TICKS-PER-CYCLE - sets the number of ticks that will elapse for each cycle. NUM-CARS - the number of cars in the simulation (you must press the SETUP button to see the change) SPEED-LIMIT - sets the maximum speed for the cars When you've selected an intersection, the "current" label will move to the new intersection and this button will automatically pop up. When this button is depressed, click in the intersection which you would like to make current. SELECT INTERSECTION - allows you to select a new "current" light. A light can be changed manually even if it is operating in auto mode. All lights are set to auto, and all phases are set to 0.ĬHANGE LIGHT - changes the direction traffic may flow through the current light. SETUP - generates a new traffic grid based on the current GRID-SIZE-X and GRID-SIZE-Y and NUM-CARS number of cars. You may continue to make changes to the lights while the simulation is running. Start the simulation by pressing the GO button. You may select the current intersection using the SELECT INTERSECTION control. Changes to the state of the current light are made using the CURRENT-AUTO?, CURRENT-PHASE and CHANGE LIGHT controls. Press the SETUP button.Īt this time, you may configure the lights however you like, with any combination of auto/manual and any phase. Change any other of the settings that you would like to change.
#Netlogo traffic simulation how to#
HOW TO USE ITĬhange the traffic grid (using the sliders GRID-SIZE-X and GRID-SIZE-Y) to make the desired number of lights. Initially, all lights will automatically change at the beginning of each cycle. Second, lights can change automatically, once per cycle. First, the user can change any light at any time by making the light current, and then clicking CHANGE LIGHT. There are two different ways the lights can change. If there is a red light or a stopped car in front of them, they stop.
If there is a slower car in front of them, they match the speed of the slower car and decelerate. If their current speed is less than the speed limit and there is no car directly in front of them, they accelerate. HOW IT WORKSĮach time step, the cars attempt to move forward at their current speed. Try to develop strategies to improve traffic and to understand the different ways to measure the quality of traffic. This allows you to explore traffic dynamics, which can lead into many areas of study, from calculus to social studies. You control traffic lights and overall variables, such as the speed limit and the number of cars, in a real-time traffic simulation. Do you have questions or comments about this model?
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