This example demonstrates a custom data-loading module for D3.js v5, using a dispatch-based event system to manage asynchronous CSV and GeoJSON data. The module, defined as `d3Edge.dataManager`, loads Zurich transit delay data via `d3.csv`, applies a cleaning function to parse timestamps with `d3.time.format` and convert coordinates, and then dispatches a readiness event. The accompanying HTML page shows a "loading" message until the data is prepared, after which users can inspect the cleaned data in the console.