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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. GTFS-flex remedies this, enabling trip planning software such as OpenTripPlanner to generate trips combining demand-responsive and fixed route service.
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.
The Vermont Agency of Transportation was the first agency to implement GTFS-flex. A demonstration project for the FTA's Mobility on Demand Sandbox, the GTFS-flex implementation in Vermont aims to provide a better trip planner than existing tools with the goal of increasing transit ridership statewide.
Vermont's trip planner is available at this link.
- Cordahi, G., Shaheen, S., Martin, E.. " MOD Sandbox Demonstrations Independent Evaluation (IE) Vermont Agency of Transportation (VTrans) OpenTripPlanner Evaluation Plan" June 1 2018. https://rosap.ntl.bts.gov/view/dot/36390/