Demonstration 3 -- Heavy Flow

Here is a control law that was evolved for a traffic network with heavy traffic volumes:

Starting the demonstration

See the page "Using Demos" for important information

To see the control law best, try viewing intersections 3 and 4.

Explanation of Control Law

A four intersection network was used when evolving this control law. It consisted of two one-way streets (both are eastbound) and two two-way streets (both north-south). The eastbound and north-south streets had the same entry volume, being 1000 cars/hour.

This control law merely shows how the creature adapted to dealing with heavy volumes. As you can see, one of its main criteria is to keep the green light with the moving traffic until the number of cars in the stopped lane exceeds the number of cars in the moving lane. It also waits for a certain amount of time to pass, or until it realizes the queue is full.

GP Notes

This creature was found after exploring 4600 different control laws, with a population size of 1000 creatures.