OASIS: Online Application for Signalized Intersection Simulation

Quick Start

1. Choose Main Street, Drive Side, and Control Type.
2. Click Run to start the controller, or Step +1s for slow inspection.
3. Click detector rectangles on the canvas to place manual calls.
4. Run Traffic when you want the animated traffic stream to actuate detectors automatically.
5. Use Save State to preserve a scenario as JSON.

Example Uses

• Fixed-time baseline: set Control Type to Fixed Time and inspect the phase timing table.
• Actuated operation: enable traffic, vary demand by approach, and watch extension/presence changes.
• Controller editing: change an LCD page value and apply it back to the signal model.

Things To Notice

• The app models controller logic for teaching and inspection, not field deployment.
• SPaT/MAP export is for data-interchange demonstration.

References

• The OASIS module is described as part of the original STREET suite in Liao, Liu, and Levinson (2009). https://doi.org/10.3141/2109-02
• Liao, C.-F., Liu, H. X., and Levinson, D. M. (2009). Simulating Transportation for Realistic Engineering Education and Training: Engaging Undergraduate Students in Transportation Studies. Transportation Research Record, 2109, 12-21. https://doi.org/10.3141/2109-02
• Original STREET project: Simulating Transportation for Realistic Engineering Education and Training, University of Minnesota legacy project site. http://street.umn.edu