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Fetch all CTA routes. This is usually the first call in a session: use the 'rt' field from each returned route as the route designator for get_directions, get_stops_for_route, get_predictions_for_stop, get_patterns, and get_detours.

Fetch all stops for a route heading in a specified direction. Use the 'stpid' field from a result as input to get_predictions_for_stop. Call get_directions(rt) first if you don't already have a valid direction id.

Fetch the top number of predictions or just the latest one if not specified for buses on a specific stop. This is real-time data and is always live, never cached.

Fetch a vehicle's live location based on its id. This is real-time data and is always live, never cached. The returned 'pid' field can be passed to get_patterns to draw the vehicle's route shape.

Fetch the current BusTime system date and time. Useful for reconciling against prediction timestamps ('prdtm') from get_predictions_for_stop. Always live, never cached.

Fetch the set of directions serviced by the specified route. Use the 'id' field (not the human-readable 'name') from a result as the 'direction' parameter for get_stops_for_route.

Fetch pattern points for a comma-delimited list of pattern ids (pid, max 10), or all active patterns for a single route (rt). Provide exactly one of pid or rt, not both. Useful for drawing a route or vehicle's path on a map.

Fetch the list of locales (languages) supported by the API. Not currently consumed by other tools here, but useful to validate a 'locale' value before it's added elsewhere.

Fetch active detours in the system. Optionally filter by route (rt) and, if rt is given, by direction. Check this before trusting a get_stops_for_route or get_patterns result is current, since detours can add/remove stops or shift pattern geometry.

Fetch enhanced detour data (used by GTFS-RT systems), including affected patterns, trips, and stops. Only returns data when detour support is enabled in BusTime for this API key; may return an 'Unsupported function' error otherwise (this is a CTA-side account limitation, not a bug in this tool).