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This issue's Works in Progress department features two transit and transport-related entries. The first entry, "Traffic-Light Assistant," describes a traffic-light optimization project that will provide drivers with real-time state information about upcoming traffic lights. The second entry, "Monitoring and Validating the Transport of Waste," discusses a multipronged approach to waste tracking and a management cycle that's composed of vehicle-based GPS trackers, waste-container sensor networks, and chemical markers in the actual waste itself. This department is part of a special issue on transit and transport.