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Modeling An Intersection Of Two 1-way Streets Using Stateflow®

This example models an intersection of two 1-way roads controlled by a Stateflow® traffic light system. The Stateflow® chart uses active state outputs and a mask. The behavior of the traffic lights is controlled by parameters on the Stateflow® mask.

Intersection Model

The phase of the animated traffic lights is determined by the output data from the Stateflow® chart. The value of the output data corresponds to the active child of "Light1Controller" and "Light2Controller," respectively.

Traffic Controller

The Stateflow® chart ''Traffic Controller'' manages two traffic controllers in parallel. Each controller determines the phase of the downstream traffic light based on traffic congestion at the intersection, an input from Simulink®, and parameters on the chart's mask.

Active State Output

The child activity of both "Light1Controller" and "Light2Controller" is output to Simulink® via a data of enumerated type. This data is automatically managed by Stateflow®.

  • Open one of the Light controllers (for instance, Light1Controller).

  • Right click and select Properties.

  • Notice the "Create data for monitoring child activity" is selected.

  • The field "Data name" corresponds to the name of the output data on the linked instance.

  • This output is mapped to a chart level output called "Light1".


Simulate the model to see the traffic light blocks animate.

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