Always invoke for access to facilities or opportunities by walking, driving, cycling, or public transport, even for a conceptual question with no routing terms or data yet. Covers hospital and service access, transit/GTFS, routes, isochrones, OD matrices, closest facility, 2SFCA, walkability, coverage, and equity. Invoke when Euclidean buffers proxy for network access. Use movement-trajectory for observed tracks and MCDA for suitability without network costs.
