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GTFS-flex is a feed specification that allows agencies to apply typical public-transit metrics to demand-responsive or paratransit. As more agencies and transit passengers turn to GTFS for information on fixed route, scheduled service, the lack of accommodation for flexible route, demand-responsive service has become an issue for paratransit and non-urban areas. The Vermont Agency of Transportation is working on a GTFS-flex specification to bring rural transit and paratransit to apps like Google Maps.