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GTFS-flex is an extension of the General Transit Feed Specification designed to enable trip planning for various types of demand-responsive or paratransit service. While GTFS-powered feeds offer convenient information on fixed route, scheduled service, they are not designed to show demand-responsive service, leaving users in certain areas with an incomplete picture of their options. The Vermont Agency of Transportation is working on a GTFS-flex specification to bring rural transit and paratransit to apps like Google Maps.
Tulare County, California
TCaT (Tulare County Area Transit) uses a GTFS-flex powered trip planner to integrate their demand-responsive and fixed route service, providing convenience for users. It also reminds users about the requirement to call a day ahead to arrange demand-responsive service.