Add traffic_flow example

[Nandha-kumar-S]

Summary

Adds a new traffic_flow example demonstrating a minimal traffic model in Mesa (tested on Mesa 3.3.1). Includes a CLI runner for ASCII output and a SolaraViz UI entrypoint.

Motive

Developer Experience (DevEx) Audit

Implementation

traffic_flow/agent.py: CarAgent that checks the cell to the right and moves if empty.
traffic_flow/model.py: TraficFlow model.
run.py: CLI runner printing the grid each tick.
app.py: SolaraViz page.
README.md: usage + parameters.

Usage Examples

cd examples/traffic_flow
python run.py

Screenshot

[Nandha-kumar-S]

hi @EwoutH @jackiekazil , Can u look into this new model please, any feedbacks will be helpful. Also i built the base logic to be highly scalable, planning to expand it with:
i.Traffic Lights: Agents that flip states (red/green) and block cells.
ii.Variable Speeds: Implementing a Nagel-Schreckenberg algorithm where cars calculate their speed based on empty space ahead.
iii.Behavioral Logic: Aggressive vs. polite drivers for lane-changing.

[jackiekazil]

I will take a look in the next 48 hrs or so.