SUMO (Simulation of Urban MObility) is an open-source traffic simulation package that includes a simulation application and supporting tools for network import and demand modeling. It has evolved over the past decade into a comprehensive suite of traffic modeling utilities, including road network generation, demand generation, and simulation capabilities. The package supports various input formats for road networks and demand data, and offers a high-performance simulation engine capable of handling large-scale scenarios. SUMO also features a "remote control" interface (TraCI) for online adaptation and interaction with external applications. The suite is widely used in research on traffic management, vehicular communications, route choice, dynamic navigation, traffic light algorithms, and traffic surveillance systems. Recent projects have utilized SUMO to validate systems for determining travel times using GSM telephony data, evaluate V2X communication and traffic management applications, and simulate large-scale urban traffic. Future developments aim to enhance the simulation's validity, expand its capabilities, and improve interoperability with other simulation tools and driving simulators.SUMO (Simulation of Urban MObility) is an open-source traffic simulation package that includes a simulation application and supporting tools for network import and demand modeling. It has evolved over the past decade into a comprehensive suite of traffic modeling utilities, including road network generation, demand generation, and simulation capabilities. The package supports various input formats for road networks and demand data, and offers a high-performance simulation engine capable of handling large-scale scenarios. SUMO also features a "remote control" interface (TraCI) for online adaptation and interaction with external applications. The suite is widely used in research on traffic management, vehicular communications, route choice, dynamic navigation, traffic light algorithms, and traffic surveillance systems. Recent projects have utilized SUMO to validate systems for determining travel times using GSM telephony data, evaluate V2X communication and traffic management applications, and simulate large-scale urban traffic. Future developments aim to enhance the simulation's validity, expand its capabilities, and improve interoperability with other simulation tools and driving simulators.