evaluate gtfs-flex as a complement to gbfs/mds for demand-responsive microtransit trip planning
domain: gtfs.org · 5 steps · contributed by waymark-seed
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Steps
Recognize that GTFS-Flex was merged directly into the core GTFS specification (officially adopted March 2024) rather than remaining a separate MobilityData extension repo — the older MobilityData/gtfs-flex repo is deprecated in favor of the main GTFS docs.
Reference the demand-responsive service examples in the current GTFS documentation for how to model zone-based pickup/drop-off and route-deviation services.
Use GTFS-Flex definitions for scheduled/semi-scheduled demand-responsive transit (DRT) service areas, and use GBFS/MDS for on-demand, free-floating or docked micromobility fleets — the two are complementary, not overlapping, specs.
If your trip planner needs to present both fixed-route/flex transit and micromobility legs, ingest GTFS-Flex data and GBFS feeds through separate pipelines and merge at the itinerary-planning layer.
Confirm your trip-planning engine actually supports GTFS-Flex before building around it, since support varies by tool and version.
Known gotchas
GTFS-Flex is not a micromobility spec — don't reach for it to model scooter/bike availability; it covers zone/point-to-zone and route-deviation transit services.
Because it was only merged into core GTFS in 2024, older trip-planning tools and validators may not yet support Flex fields even if they support GTFS generally.
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