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U.S. Department of Transportation
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Transit Signal Priority (TSP)
§Enables earlier, more accurate and continuous monitoring of transit vehicles as they approach and progress through the intersection, and potentially down an entire corridor
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§Selects the most appropriate priority strategy based on knowledge of up-to-the second location and multiple conditionality criteria
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§Enables TSP on a network of arterials
http://www.fhwa.dot.gov/advancedresearch/images/signal.jpg
This application will use connected vehicles communications and SPaT data to grant conditional signal priority on the basis of passenger load, schedule/headway adherence, service type, time-of-day, and peak direction of travel.  It will include a library of “smart” priority strategies to implement (e.g., green extension, red truncation, phase rotation, etc.) that depend on time of arrival at the intersection (obtained through connected vehicles enabled location monitoring) and SPaT data obtained by the signal controller.  Priority decisions will be made either at the RSE or signal controller with RSE communication.
Second bullet – Criteria includes: Schedule/headway adherence, passenger loads, service type, time of day and peak direction

Image Ref.
http://www.fhwa.dot.gov/advancedresearch/images/signal.jpg