Traffic Light Simulation Lynn Jepsen. Introduction and Background Try and find the most efficient way to move cars through an intersection at different.

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Presentation transcript:

Traffic Light Simulation Lynn Jepsen

Introduction and Background Try and find the most efficient way to move cars through an intersection at different traffic densities Want to see waiting time and queue length go down Green light usage needs to go up Many traffic simulations out there, but none that I have seen with a learning light

Simulation Simulation that obeys most “rules of the road”

Simulation Cars on each lane take up a certain number of spaces and have a certain speed at each instant Speed and space is update every.1 sec along with graphics Speed up when object in front is getting farther away but with a max. accel. Slow down for red and most yellow lights Use Java to show graphics

Light Algorithm Wants to optimize efficiency (defined as queue length, wait time and green light usage) Independent variables are traffic density, cycle length(length of one cycle in intersection) and ratio (ratio of green light time in each direction) Can NOT change traffic density Uses previous data (relationships of all 5 variables) too pick best cycle length and ratio

Graphs graph all three efficiency variables north/south line and an east/west line if the algorithm is really optimizing the intersection then the two lines are close to each other

Efficiency the intersection can only be so efficient if there are just too many cars for the number of lanes, then the algorithm will not work as well as it would in a lighter traffic density This is not an exact science. There are too many variables in effect here. You can’t possibly minimize wait time to the point where no one waits. Traffic flow is just too erratic to predict well.

Multiple Lanes now includes multiple lanes in any direction has little other effect on the light algorithm increase the yellow light time when there are too many lanes next task :make it so that cars can change lanes

Results and Conclusions The simulation looks realistic Light algorithm does cause fewer backups lots more lanes does not effect light algorithm, so it is still useful