The Realtime API is a RESTful web service designed to serve bus location data gathered by our Advanced Transportation Management System (ATMS) and the new Nextrip prediction engine. This is the result of years of difficult work refining the information we collect from the GPS trackers on every bus. Sometimes that data arrives too late to give us useful information. Our buses serve 1433 square miles. Whenever the buses travel into a radio shadow we need to make a prediction about the location of the bus. This is where Nextrip comes into play.