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SUMO is a microscopic, multi-modal traffic simulation.
SUMO is an open source, highly portable, microscopic and continuous traffic simulation package designed to handle large networks. It allows for intermodal simulation including pedestrians and comes with a large set of tools for scenario creation.
The code and the issue tracker can be found at https://github.com/eclipse-sumo/sumo/
The documentation can be found at https://sumo.dlr.de/docs/